1. WARM UP 1) ABCD is a parallelogram. Find the measures of x and y.

2. Section 7.5 Theorems for Similar Triangles

3. Similar TRIANGLES AA Similarity Postulate SAS Similarity Theorem SSS Similarity Theorem

4. The sides of ΔABC are 4, 5, and 7, and the sides of ΔXYZ are 16, 20, and 28. Are the two triangles similar? 4 5 7 16 20 28 YES ~ ~ ~~ ~~ ~ ~ ~ ~ ~ ~

5. Name the similar triangles. Why? 6:9 10:15 2:3 SAS ~ ∆CDE~∆CAB

6. Name the similar triangles and give the postulate or theorem that justifies your answer. SSS ~∆LKM~∆OKN 3:6 6:12 5:10

7. Name the similar triangles and give the postulate or theorem that justifies your answer. AA ~ ∆DAE~∆BAC o o

8. Practice Worksheet