1. Are there shortcut postulates or theorems for similarity?
7-2A Similar Triangles
Are there shortcut postulates or theorems for similarity?

2. Checking Up
Draw two triangles of different sizes with two pairs of corresponding angles congruent.
Are the remaining angles congruent?
Are the side lengths proportional?

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

4. Give a similarity correspondence. Explain why the triangles are similar.Z V W Y X A B C D E
∆ABE ~ ∆CBD AA
∆ZVY ~ ∆ZWX AA

5. Give the similarity correspondence. Solve for xB C D E 4 2
9.1 x
∆ACB ~ ∆ECD

6. Are there shortcut postulates or theorems for similarity?
Yes, Angle-Angle (AA)

7. Assignment 7-2A
Page 488, 1-9, 20-26