7-3 Proving Triangles Similar. Triangle Similarity Angle-Angle Similarity Postulate: If two angles of one triangle are congruent to two angles of another.

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7-3 Proving Triangles Similar

Triangle Similarity Angle-Angle Similarity Postulate: If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar. Side-Angle-Side Similarity Theorem: If an angle of one triangle is congruent to an angle of a second triangle, and the sides that include the two angles are proportional, then the triangles are similar. Side-Side-Side Similarity Theorem: If the corresponding sides of two triangles are proportional, then the triangles are similar.

Using the AA Similarity Postulate Are the two triangles similar?

 Are the two triangles similar?

Verifying Triangle Similarity Are the triangles similar? Explain. If so, write a similarity statement.

 Are the triangles similar? Explain. If so, write a similarity statement.

Finding Lengths in Similar Triangles You can use indirect measurement to find lengths that are difficult to measure directly. You want to know the height of a cliff, so you place a mirror on the ground and walk backwards until you can see the top of the cliff in the mirror. What is the height of the cliff?