 7.4 A Postulate for Similar Triangles. We can prove that 2 triangles are similar by showing that all 3 corresponding angles are congruent, and all 3 sides.

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7.4 A Postulate for Similar Triangles

We can prove that 2 triangles are similar by showing that all 3 corresponding angles are congruent, and all 3 sides are in proportion to one another (same as showing any 2 polygons similar) But there are simpler methods to prove 2 triangles similar.

AA Similarity Postulate If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.

Are these triangles similar, if so, then why? Can you find x? And AE and ED? What is the scale factor?

Homework pg. 257 1-17

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