1. Proving Triangles Similar
10/22/12 Unit 2 Triangles
Proving Triangles Similar
(AA, SSS, SAS)

2. AA Similarity (Angle-Angle)
If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar….or the third pair of angles are congruent.
Given:
and
Conclusion:

3. SSS Similarity (Side-Side-Side)
If the measures of the corresponding sides of two triangles are in the same ratio, then the triangles are similar. 5 11 22 8 16 10
Given:
Conclusion:

4. SAS Similarity (Side-Angle-Side)
If the measures of two sides of a triangle are in the same ratio to the measures of two corresponding sides of another triangle and the angles between them are congruent, then the triangles are similar. 5 11 22 10
Given:
Conclusion: