# Similar Triangles and Triangle Classification in 8th Grade Geometry

This page provides a comprehensive overview of similar triangles, the Pythagorean theorem, and triangle classification in **8th grade geometry**. The content is organized into several key sections, each focusing on important concepts and definitions.

The first section introduces similar figures, explaining that they have the same shape but not necessarily the same size. It states that similar figures can be transformed into each other and have congruent corresponding angles and proportional corresponding side lengths.

**Definition**: Similar figures have the same shape but not necessarily the same size, with congruent corresponding angles and proportional corresponding side lengths.

The next part outlines methods to prove similarity, including:

**Highlight**: Three criteria for proving triangle similarity:

- AA (angle, angle)
- SAS (side, angle, side)
- SSS (side, side, side)

The page then introduces the **Pythagorean theorem**, a fundamental concept in **8th grade geometry**.

**Example**: The Pythagorean theorem is illustrated with the equation a² + b² = c², where c is the hypotenuse of a right triangle.

**Definition**: The Pythagorean theorem states that in a right triangle, the sum of the squares of the lengths of the two legs equals the square of the length of the hypotenuse.

The document also covers similarity transformations, including translation, rotation, reflection, and dilation. These transformations are essential in understanding how similar figures relate to each other.

**Vocabulary**: Dilation is a transformation that enlarges or reduces a figure by a scale factor, maintaining its shape.

Lastly, the page provides a classification of triangles based on their sides and angles. This section is particularly useful for students working on **classifying triangles 8th grade notes**.

**Highlight**: Triangle classification by sides:

- Equilateral triangles have 3 equal sides
- Isosceles triangles have 2 equal sides
- Scalene triangles have no equal sides

**Highlight**: Triangle classification by angles:

- Acute triangles have all angles less than 90°
- Right triangles have one 90° angle
- Obtuse triangles have one angle greater than 90°

This comprehensive overview provides students with a solid foundation in **8th grade geometry**, covering **similar triangles**, the **Pythagorean theorem**, and triangle classification. The visual representations and clear definitions make it an excellent resource for students studying these topics.