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Cool Geometry Notes: Free PDFs for 9th and 10th Graders!

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Polsen Desire

8/9/2023

Geometry

Geometry notes

Cool Geometry Notes: Free PDFs for 9th and 10th Graders!

Geometry fundamentals form the cornerstone of spatial mathematics and problem-solving skills.

Basic geometry notes begin with understanding fundamental elements like points, lines, and planes. A point represents a specific location in space with no dimension, while a line segment is a portion of a line with two endpoints. Lines extend infinitely in both directions and can be named using two points on the line. A ray in geometry starts at one point and extends infinitely in one direction, similar to a beam of light.

The study of geometry builds upon these basics to explore more complex concepts like the Pythagorean theorem and distance formula. The distance formula, derived from the Pythagorean theorem, allows students to calculate the distance between any two points on a coordinate plane. This formula becomes essential in both geometry and physics, where understanding spatial relationships is crucial. Students working with geometry notes for high schoolers learn to apply these concepts through various problem-solving scenarios, from calculating the length of a building's shadow to determining the distance between cities on a map. The distance formula geometry applications extend beyond simple calculations, helping students develop critical thinking skills and spatial awareness. When working with triangles and other polygons, students use these foundational concepts to analyze shapes, calculate perimeters, and solve real-world problems. The interconnected nature of these geometric concepts creates a robust framework for understanding more advanced mathematical principles in later studies.

These concepts are typically covered in geometry notes 9th grade and geometry notes 10th grade, providing students with essential tools for mathematical reasoning and problem-solving. Through practice with points, lines segments and rays worksheets, students develop proficiency in identifying and working with these basic geometric elements. The progression from simple concepts to more complex applications helps build a strong foundation in spatial reasoning and mathematical logic, skills that prove valuable across various academic disciplines and real-world applications.

...

8/9/2023

1708


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Understanding Basic Geometry: Points, Segments, and Lines

Geometry forms the foundation of spatial mathematics, with its rich history dating back to Euclid, known as the Father of Modern Geometry. His thirteen books on Elements remain foundational to modern mathematical understanding. Let's explore the fundamental building blocks of basic geometry.

Definition: A point is an infinitesimally small location in space with no dimensions - only position. It serves as the most basic element in geometry.

In basic geometry, we start with points and build more complex structures. A line segment, which consists of two endpoints and all points between them, represents a finite distance. When we extend a line segment infinitely in both directions, we create a line - the shortest path between any two points.

Example: Consider line segment AB with endpoints A and B. We can measure its length using coordinates:

  • If A is at 2,32,3 and B is at 5,75,7
  • The length can be calculated using the distance formula
  • This demonstrates how points, lines segments and rays connect in practical applications

<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Pythagorean Theorem and Distance Formula Applications

The Pythagorean theorem and distance formula are essential tools for calculating distances in geometry. These concepts build upon our understanding of points and line segments to solve real-world problems.

Highlight: The Pythagorean theorem states that in a right triangle, a² + b² = c², where c is the hypotenuse and a,b are the other sides.

When working with coordinates, the distance formula geometry derives directly from the Pythagorean theorem:

  • Distance = √(x2x1)2+(y2y1)2(x₂-x₁)² + (y₂-y₁)²
  • This formula works in any coordinate plane
  • It's particularly useful in geometry notes for high schoolers

Example: To find the distance between points 3,23,2 and 9,49,4:

  1. Use the distance formula
  2. Plug in coordinates: √(93)2+(42)2(9-3)² + (4-2)²
  3. Simplify: √36+436 + 4 = √40 = 2√10 units

<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Advanced Geometric Concepts: Rays, Angles, and Planes

Building on fundamental concepts, we explore more complex geometric structures that form the basis of high school geometry notes. Understanding rays, angles, and planes is crucial for advanced geometric study.

Vocabulary:

  • Ray: A part of a line starting at a point and extending infinitely in one direction
  • Angle: Formed by two rays sharing a common endpoint vertexvertex
  • Plane: An infinite flat surface extending in all directions

These concepts are particularly important in geometry notes 9th grade and geometry notes 10th grade, as they form the foundation for more advanced topics like trigonometry and spatial geometry.

Definition: An angle is measured in degrees, with a complete rotation being 360°. The vertex is always written in the middle when naming an angle ABChasBasitsvertex∠ABC has B as its vertex.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Measuring Techniques in Geometry

Accurate measurement is fundamental to practical geometry applications. Whether using the metric or English system, precise measurements enable us to apply geometric concepts to real-world situations.

Example: To measure an angle:

  1. Place the protractor's center point at the angle's vertex
  2. Align the baseline with one ray
  3. Read the degree measurement where the second ray intersects the protractor's scale

Understanding angle classifications helps in problem-solving:

  • Acute angles: Less than 90°
  • Right angles: Exactly 90°
  • Obtuse angles: Greater than 90°

Highlight: When measuring line segments, always align the zero mark with one endpoint and read the measurement at the other endpoint for accurate results.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Understanding Perpendicular Lines and Geometric Relationships

Geometry notes for high schoolers begin with fundamental concepts of perpendicular relationships. When two geometric elements intersect to form a 90-degree angle, they are considered perpendicular to each other. This applies to lines, rays, and segments in basic geometry.

Definition: Perpendicular lines, rays, or segments meet at exactly 90 degrees, forming right angles. The perpendicular symbol indicates this relationship.

Understanding perpendicular relationships is crucial for various geometric applications. In construction and engineering, perpendicular lines ensure structural stability and proper alignment. Architects rely on perpendicular relationships to design buildings with right angles, while carpenters use them to create square corners in furniture and buildings.

The concept of perpendicularity extends beyond simple lines. In coordinate geometry, perpendicular lines have slopes that are negative reciprocals of each other. This relationship is essential for solving complex geometric problems and understanding spatial relationships in both two and three dimensions.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Congruence in Geometry: Understanding Equal Measurements

Congruence is a fundamental concept in geometry notes 9th grade and 10th grade curriculum. Two geometric figures are congruent when they have exactly the same size and shape, even if they are positioned differently in space.

Vocabulary: Congruent figures have equal corresponding measurements and can be superimposed perfectly on each other.

When dealing with line segments, congruence means that their lengths are equal. For example, if segment AB is congruent to segment CD writtenasABCDwritten as AB ≅ CD, they have the same length. This concept extends to angles, triangles, and other polygons, where all corresponding parts must be equal for the figures to be congruent.

The practical applications of congruence appear in various fields. Manufacturing relies on congruence to ensure identical parts are produced. In architecture, congruent elements create symmetry and balance in design. Understanding congruence is also essential for solving geometric proofs and analyzing geometric transformations.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Inductive Reasoning in Geometry: Pattern Recognition

Inductive reasoning in basic geometry pdf involves observing specific examples to form general conclusions. This logical process helps students discover geometric patterns and make mathematical conjectures.

Example: By measuring angles in multiple triangles and finding that they always sum to 180 degrees, we can inductively reason that this is true for all triangles.

The power of inductive reasoning lies in its ability to help discover mathematical relationships. For instance, when studying patterns in geometric sequences or analyzing relationships between geometric figures, inductive reasoning allows us to form hypotheses about general rules.

Consider the rope-cutting example: by observing that each cut increases the number of pieces by one, we can derive the formula P = C + 1, where P represents pieces and C represents cuts. This demonstrates how inductive reasoning leads to mathematical formulas and relationships.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Deductive Reasoning and Logical Operations in Geometry

Deductive reasoning forms the backbone of geometric proofs and logical thinking in geometry notes for high schoolers pdf free. Unlike inductive reasoning, deductive reasoning uses established facts, rules, and properties to reach definitive conclusions.

Highlight: Deductive reasoning moves from general principles to specific conclusions, providing certainty in geometric proofs.

Venn diagrams serve as powerful tools for visualizing logical relationships in geometry. They help illustrate concepts like intersection ANDoperationsAND operations and union ORoperationsOR operations of sets. For example, understanding that "all squares are rectangles" but "not all rectangles are squares" becomes clearer through Venn diagram representation.

The application of deductive reasoning extends to real-world problem-solving. Engineers use deductive reasoning to ensure structural integrity, while computer programmers apply logical operations to create efficient algorithms. This systematic approach to reasoning is essential for advanced geometric concepts and mathematical proof writing.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

View

Understanding Implications and Converses in Basic Geometry

The foundation of logical reasoning in geometry involves understanding implications and their converses. This concept is crucial for students studying basic geometry and forms an essential part of high school geometry notes.

When working with implications in geometry, we use "if-then" statements to express relationships between conditions. An implication has two parts: the hypothesis ifpartif part and the conclusion thenpartthen part. For example, in the statement "If you cut a pizza through the center c times, then you get 2c pieces," the number of cuts is the hypothesis, and the number of pieces is the conclusion.

Definition: A counterexample is a specific case where the hypothesis is true but the conclusion is false, proving that an implication is not always true.

Consider the pizza-cutting scenario as a practical application. While cutting a pizza through the center three times typically yields six pieces 2×3=62 × 3 = 6, making random cuts can result in seven pieces instead. This serves as a counterexample, demonstrating that the original implication only holds true under specific conditions.

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Geometry

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Aug 9, 2023

147 pages

Cool Geometry Notes: Free PDFs for 9th and 10th Graders!

P

Polsen Desire

@polsendesire_scre

Geometry fundamentals form the cornerstone of spatial mathematics and problem-solving skills.

Basic geometry notes begin with understanding fundamental elements like points, lines, and planes. A point represents a specific location in space with no dimension, while a line segmentis... Show more


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Basic Geometry: Points, Segments, and Lines

Geometry forms the foundation of spatial mathematics, with its rich history dating back to Euclid, known as the Father of Modern Geometry. His thirteen books on Elements remain foundational to modern mathematical understanding. Let's explore the fundamental building blocks of basic geometry.

Definition: A point is an infinitesimally small location in space with no dimensions - only position. It serves as the most basic element in geometry.

In basic geometry, we start with points and build more complex structures. A line segment, which consists of two endpoints and all points between them, represents a finite distance. When we extend a line segment infinitely in both directions, we create a line - the shortest path between any two points.

Example: Consider line segment AB with endpoints A and B. We can measure its length using coordinates:

  • If A is at 2,32,3 and B is at 5,75,7
  • The length can be calculated using the distance formula
  • This demonstrates how points, lines segments and rays connect in practical applications

<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Pythagorean Theorem and Distance Formula Applications

The Pythagorean theorem and distance formula are essential tools for calculating distances in geometry. These concepts build upon our understanding of points and line segments to solve real-world problems.

Highlight: The Pythagorean theorem states that in a right triangle, a² + b² = c², where c is the hypotenuse and a,b are the other sides.

When working with coordinates, the distance formula geometry derives directly from the Pythagorean theorem:

  • Distance = √(x2x1)2+(y2y1)2(x₂-x₁)² + (y₂-y₁)²
  • This formula works in any coordinate plane
  • It's particularly useful in geometry notes for high schoolers

Example: To find the distance between points 3,23,2 and 9,49,4:

  1. Use the distance formula
  2. Plug in coordinates: √(93)2+(42)2(9-3)² + (4-2)²
  3. Simplify: √36+436 + 4 = √40 = 2√10 units

<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Advanced Geometric Concepts: Rays, Angles, and Planes

Building on fundamental concepts, we explore more complex geometric structures that form the basis of high school geometry notes. Understanding rays, angles, and planes is crucial for advanced geometric study.

Vocabulary:

  • Ray: A part of a line starting at a point and extending infinitely in one direction
  • Angle: Formed by two rays sharing a common endpoint vertexvertex
  • Plane: An infinite flat surface extending in all directions

These concepts are particularly important in geometry notes 9th grade and geometry notes 10th grade, as they form the foundation for more advanced topics like trigonometry and spatial geometry.

Definition: An angle is measured in degrees, with a complete rotation being 360°. The vertex is always written in the middle when naming an angle ABChasBasitsvertex∠ABC has B as its vertex.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Improve your grades

Join milions of students

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Measuring Techniques in Geometry

Accurate measurement is fundamental to practical geometry applications. Whether using the metric or English system, precise measurements enable us to apply geometric concepts to real-world situations.

Example: To measure an angle:

  1. Place the protractor's center point at the angle's vertex
  2. Align the baseline with one ray
  3. Read the degree measurement where the second ray intersects the protractor's scale

Understanding angle classifications helps in problem-solving:

  • Acute angles: Less than 90°
  • Right angles: Exactly 90°
  • Obtuse angles: Greater than 90°

Highlight: When measuring line segments, always align the zero mark with one endpoint and read the measurement at the other endpoint for accurate results.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Understanding Perpendicular Lines and Geometric Relationships

Geometry notes for high schoolers begin with fundamental concepts of perpendicular relationships. When two geometric elements intersect to form a 90-degree angle, they are considered perpendicular to each other. This applies to lines, rays, and segments in basic geometry.

Definition: Perpendicular lines, rays, or segments meet at exactly 90 degrees, forming right angles. The perpendicular symbol indicates this relationship.

Understanding perpendicular relationships is crucial for various geometric applications. In construction and engineering, perpendicular lines ensure structural stability and proper alignment. Architects rely on perpendicular relationships to design buildings with right angles, while carpenters use them to create square corners in furniture and buildings.

The concept of perpendicularity extends beyond simple lines. In coordinate geometry, perpendicular lines have slopes that are negative reciprocals of each other. This relationship is essential for solving complex geometric problems and understanding spatial relationships in both two and three dimensions.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Improve your grades

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Congruence in Geometry: Understanding Equal Measurements

Congruence is a fundamental concept in geometry notes 9th grade and 10th grade curriculum. Two geometric figures are congruent when they have exactly the same size and shape, even if they are positioned differently in space.

Vocabulary: Congruent figures have equal corresponding measurements and can be superimposed perfectly on each other.

When dealing with line segments, congruence means that their lengths are equal. For example, if segment AB is congruent to segment CD writtenasABCDwritten as AB ≅ CD, they have the same length. This concept extends to angles, triangles, and other polygons, where all corresponding parts must be equal for the figures to be congruent.

The practical applications of congruence appear in various fields. Manufacturing relies on congruence to ensure identical parts are produced. In architecture, congruent elements create symmetry and balance in design. Understanding congruence is also essential for solving geometric proofs and analyzing geometric transformations.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Inductive Reasoning in Geometry: Pattern Recognition

Inductive reasoning in basic geometry pdf involves observing specific examples to form general conclusions. This logical process helps students discover geometric patterns and make mathematical conjectures.

Example: By measuring angles in multiple triangles and finding that they always sum to 180 degrees, we can inductively reason that this is true for all triangles.

The power of inductive reasoning lies in its ability to help discover mathematical relationships. For instance, when studying patterns in geometric sequences or analyzing relationships between geometric figures, inductive reasoning allows us to form hypotheses about general rules.

Consider the rope-cutting example: by observing that each cut increases the number of pieces by one, we can derive the formula P = C + 1, where P represents pieces and C represents cuts. This demonstrates how inductive reasoning leads to mathematical formulas and relationships.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Improve your grades

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Deductive Reasoning and Logical Operations in Geometry

Deductive reasoning forms the backbone of geometric proofs and logical thinking in geometry notes for high schoolers pdf free. Unlike inductive reasoning, deductive reasoning uses established facts, rules, and properties to reach definitive conclusions.

Highlight: Deductive reasoning moves from general principles to specific conclusions, providing certainty in geometric proofs.

Venn diagrams serve as powerful tools for visualizing logical relationships in geometry. They help illustrate concepts like intersection ANDoperationsAND operations and union ORoperationsOR operations of sets. For example, understanding that "all squares are rectangles" but "not all rectangles are squares" becomes clearer through Venn diagram representation.

The application of deductive reasoning extends to real-world problem-solving. Engineers use deductive reasoning to ensure structural integrity, while computer programmers apply logical operations to create efficient algorithms. This systematic approach to reasoning is essential for advanced geometric concepts and mathematical proof writing.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

Sign up to see the contentIt's free!

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Understanding Implications and Converses in Basic Geometry

The foundation of logical reasoning in geometry involves understanding implications and their converses. This concept is crucial for students studying basic geometry and forms an essential part of high school geometry notes.

When working with implications in geometry, we use "if-then" statements to express relationships between conditions. An implication has two parts: the hypothesis ifpartif part and the conclusion thenpartthen part. For example, in the statement "If you cut a pizza through the center c times, then you get 2c pieces," the number of cuts is the hypothesis, and the number of pieces is the conclusion.

Definition: A counterexample is a specific case where the hypothesis is true but the conclusion is false, proving that an implication is not always true.

Consider the pizza-cutting scenario as a practical application. While cutting a pizza through the center three times typically yields six pieces 2×3=62 × 3 = 6, making random cuts can result in seven pieces instead. This serves as a counterexample, demonstrating that the original implication only holds true under specific conditions.


<p><strong>Lecture 1: Introduction - Points, Segments, and Length</strong></p>
<h3 id="basicgeometryconcepts">Basic Geometry Concepts</h3>

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Exploring Converses in Geometric Logic

The converse of an implication is formed by switching the hypothesis and conclusion. Understanding converses is essential for mastering geometry notes for high schoolers and developing strong logical reasoning skills.

Example: Original statement: "If you are in band, then you'll get good grades." Converse: "If you get good grades, then you are in band."

It's crucial to recognize that an implication and its converse are not necessarily equivalent. While one statement might be true, its converse could be false. This concept is particularly important when dealing with geometric theorems and proofs.

Highlight: The truth value of an implication does not automatically determine the truth value of its converse. Each must be evaluated independently.

In geometric reasoning, students must carefully analyze both implications and their converses to avoid making incorrect assumptions. This skill is fundamental for success in geometry notes 9th grade and geometry notes 10th grade, as it forms the basis for understanding more complex geometric proofs and theorems.

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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️

Thomas R

iOS user

Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades

Brad T

Android user

Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

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Greenlight Bonnie

Android user

I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend

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Elisha

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This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!

Paul T

iOS user