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Triangle Congruence: ASA and AAS Theorems Explained with Worksheets and Examples

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Katie Whitson

9/21/2023

Geometry

Triangle congruence by ASA and AAS

Subjects

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Geometry

/

Congruent Triangles

/

Triangle Congruence from Transformations

/

Proving the ASA and AAS Triangle Congruence Criteria Using Transformations

Triangle Congruence: ASA and AAS Theorems Explained with Worksheets and Examples

Triangle congruence by Angle-Side-Angle (ASA) and Angle-Angle-Side (AAS) are essential concepts in geometry. These theorems provide methods to prove triangles congruent without measuring all sides and angles. ASA theorem states that two triangles are congruent if two angles and the included side of one triangle are congruent to the corresponding parts of another triangle. AAS theorem states that two triangles are congruent if two angles and a non-included side of one triangle are congruent to the corresponding parts of another triangle. These theorems, along with other triangle congruence theorems like Side-Angle-Side (SAS) and Side-Side-Side (SSS), form the foundation for proving triangles congruent in geometry.

• The lesson covers ASA and AAS congruence theorems for triangles.
• It provides postulates, theorems, examples, and proofs for both ASA and AAS.
• The material includes practical applications and exercises for students to practice.
• Understanding these concepts is crucial for solving more complex geometric problems.

...

9/21/2023

279

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

View

Writing a Proof Using ASA

This page focuses on applying the ASA theorem in practical scenarios and writing formal proofs. It presents a real-world example involving the design of a miniature golf course.

Example: A teen organization is building a miniature golf course with triangular bumpers. Students are asked to prove that the bumpers meet the design conditions using the ASA theorem.

The proof is structured step-by-step, demonstrating how to use given information to establish congruence between two triangles. This example shows the practical application of geometric theorems in real-world design problems.

Highlight: The proof emphasizes the importance of identifying the given information, stating what needs to be proved, and logically applying the ASA theorem to reach the conclusion.

The page also includes a "Got It?" section, providing another example for students to practice applying the ASA theorem in a proof.

Vocabulary: Right angles are introduced in the proof, reminding students of the importance of recognizing special angle relationships in geometric proofs.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

View

Writing a Proof Using AAS

This page transitions to the application of the Angle-Angle-Side AASAAS Theorem in proofs. It provides a structured example of how to write a proof using AAS.

Example: A proof is presented using the AAS theorem, demonstrating how to establish triangle congruence when two angles and a non-included side are known to be congruent.

The proof follows a logical sequence, starting with the given information, identifying congruent parts, and applying the AAS theorem to conclude that the triangles are congruent.

Highlight: The proof introduces the use of alternate interior angles, showcasing how different geometric concepts can be combined in a single proof.

The page includes a "Got It?" section, offering another example for students to practice applying the AAS theorem in a proof scenario.

Vocabulary: The term "bisector" is used in the practice example, introducing students to the concept of angle bisection in the context of triangle congruence.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

View

Determining Whether Triangles Are Congruent

This page focuses on applying the knowledge of triangle congruence theorems to determine whether given triangles are congruent. It emphasizes critical thinking and the ability to justify answers.

Example: A diagram is presented with a question asking whether two triangles are congruent. Students are required to analyze the given information and select the best justification for their answer.

The example highlights the importance of understanding corresponding sides in triangle congruence, demonstrating that congruence cannot be established if the sides do not correspond correctly.

Highlight: This section emphasizes the importance of not just identifying congruence but also explaining why triangles are or are not congruent.

The page includes a "Got It?" section with more complex examples, requiring students to determine congruence and justify their answers using the appropriate theorem or postulate.

Vocabulary: Terms like "midpoint" and "vertical angles" are introduced, showing how these concepts can be used in conjunction with congruence theorems.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

View

Practice Problems and Applications

This final page provides a series of practice problems to reinforce understanding of ASA and AAS congruence. It includes various scenarios where students must apply their knowledge of triangle congruence theorems.

Example: One problem presents a complex diagram with given information about angles and line segments. Students are asked to prove that two triangles are congruent using the information provided.

The problems vary in complexity, some requiring the application of multiple geometric concepts to establish congruence.

Highlight: These exercises emphasize the importance of identifying the correct theorem ASA,AAS,orothersASA, AAS, or others based on the given information.

The page also includes problems that integrate other geometric concepts, such as right angles and midpoints, with triangle congruence theorems.

Vocabulary: Terms like "vertical angles" and "alternate interior angles" are used in the problems, reinforcing the interconnectedness of various geometric concepts.

This practice section serves as a comprehensive review of the triangle congruence theorems covered in the lesson, particularly focusing on ASA and AAS congruence.

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Subjects

Geometry

Congruent Triangles

Triangle Congruence from Transformations

Proving the ASA and AAS Triangle Congruence Criteria Using Transformations

 

Geometry

•

279

•

Jul 20, 2025

•

5 pages

Triangle Congruence: ASA and AAS Theorems Explained with Worksheets and Examples

user profile picture

Katie Whitson

@katie_.w0843

Triangle congruence by Angle-Side-Angle (ASA) and Angle-Angle-Side (AAS) are essential concepts in geometry. These theorems provide methods to prove triangles congruent without measuring all sides and angles. ASA theoremstates that two triangles are congruent if two angles and the... Show more

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

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Writing a Proof Using ASA

This page focuses on applying the ASA theorem in practical scenarios and writing formal proofs. It presents a real-world example involving the design of a miniature golf course.

Example: A teen organization is building a miniature golf course with triangular bumpers. Students are asked to prove that the bumpers meet the design conditions using the ASA theorem.

The proof is structured step-by-step, demonstrating how to use given information to establish congruence between two triangles. This example shows the practical application of geometric theorems in real-world design problems.

Highlight: The proof emphasizes the importance of identifying the given information, stating what needs to be proved, and logically applying the ASA theorem to reach the conclusion.

The page also includes a "Got It?" section, providing another example for students to practice applying the ASA theorem in a proof.

Vocabulary: Right angles are introduced in the proof, reminding students of the importance of recognizing special angle relationships in geometric proofs.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

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Writing a Proof Using AAS

This page transitions to the application of the Angle-Angle-Side AASAAS Theorem in proofs. It provides a structured example of how to write a proof using AAS.

Example: A proof is presented using the AAS theorem, demonstrating how to establish triangle congruence when two angles and a non-included side are known to be congruent.

The proof follows a logical sequence, starting with the given information, identifying congruent parts, and applying the AAS theorem to conclude that the triangles are congruent.

Highlight: The proof introduces the use of alternate interior angles, showcasing how different geometric concepts can be combined in a single proof.

The page includes a "Got It?" section, offering another example for students to practice applying the AAS theorem in a proof scenario.

Vocabulary: The term "bisector" is used in the practice example, introducing students to the concept of angle bisection in the context of triangle congruence.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

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Improve your grades

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Determining Whether Triangles Are Congruent

This page focuses on applying the knowledge of triangle congruence theorems to determine whether given triangles are congruent. It emphasizes critical thinking and the ability to justify answers.

Example: A diagram is presented with a question asking whether two triangles are congruent. Students are required to analyze the given information and select the best justification for their answer.

The example highlights the importance of understanding corresponding sides in triangle congruence, demonstrating that congruence cannot be established if the sides do not correspond correctly.

Highlight: This section emphasizes the importance of not just identifying congruence but also explaining why triangles are or are not congruent.

The page includes a "Got It?" section with more complex examples, requiring students to determine congruence and justify their answers using the appropriate theorem or postulate.

Vocabulary: Terms like "midpoint" and "vertical angles" are introduced, showing how these concepts can be used in conjunction with congruence theorems.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

Sign up to see the contentIt's free!

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Improve your grades

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Practice Problems and Applications

This final page provides a series of practice problems to reinforce understanding of ASA and AAS congruence. It includes various scenarios where students must apply their knowledge of triangle congruence theorems.

Example: One problem presents a complex diagram with given information about angles and line segments. Students are asked to prove that two triangles are congruent using the information provided.

The problems vary in complexity, some requiring the application of multiple geometric concepts to establish congruence.

Highlight: These exercises emphasize the importance of identifying the correct theorem ASA,AAS,orothersASA, AAS, or others based on the given information.

The page also includes problems that integrate other geometric concepts, such as right angles and midpoints, with triangle congruence theorems.

Vocabulary: Terms like "vertical angles" and "alternate interior angles" are used in the problems, reinforcing the interconnectedness of various geometric concepts.

This practice section serves as a comprehensive review of the triangle congruence theorems covered in the lesson, particularly focusing on ASA and AAS congruence.

3.3 Triangle Congruence by ASA & AAS Postulate 16- Angle-Side- Angle (ASA) Postulate Postulate-If two angles and the included Side of one tr

Sign up to see the contentIt's free!

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Join milions of students

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Triangle Congruence by ASA & AAS

This page introduces two important concepts in triangle congruence: the Angle-Side-Angle ASAASA Postulate and the Angle-Angle-Side AASAAS Theorem. These are fundamental tools for proving triangles congruent.

Definition: The ASA Postulate states that if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then the two triangles are congruent.

Definition: The AAS Theorem states that if two angles and a non-included side of one triangle are congruent to two angles and the corresponding non-included side of another triangle, then the triangles are congruent.

The page provides visual representations of both ASA and AAS congruence, showing the corresponding parts that need to be congruent for each theorem to apply.

Example: An example is given asking students to identify which two triangles are congruent by ASA, emphasizing the importance of the included side in ASA congruence.

Highlight: Understanding the difference between included and non-included sides is crucial for correctly applying ASA and AAS theorems.

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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

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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❗️❗️⚠️

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Brad T

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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

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