1. Similar Triangles
Geometry
Ms. Hough
7-3

2. Angle Angle Similarity
If two angles of one triangle are congruent to two angles of another triangle, then the two triangles are SIMILAR

3. Side Angle Side Similarity
If two sides of two triangles of proportional, and the included angles are congruent, then the triangles are similar
75° ax bx
75° a b

4. Example 1
Find AE and DE C A
x - 1 5 2 E B
x + 5 D

5. Example 2
Determine whether the pair of triangles are similar. Justify your answer…
40°
20°
120°
120°

6. Class Work
Complete 7-3 SG&I
HOMEWORK:
Page 400, Problems 1-5