7-4A Similar Figures and ProportionsLearning Objective: To determine whether two given figures are similar, and

to use similarity to find missing lengths or angle measures.

Warm-up (IN)Solve the proportions.

Notes

Learning Objective: To determine whether two given figures are similar, and to use similarity to find missing lengths or angle measures.

.

Similar figures - ~•Corresponding angles are congruent

•Corresponding sides are in proportion

S

T

U

12

X

V

W24

1672º

48º

72º60º

60º48º

8

10 20

VWXSTU ~

Learning Objective: To determine whether two given figures are similar, and to use similarity to find missing lengths or angle measures.

.

Ex 1 – The triangles are similar. Find the missing variable.a.

155

182x

215 x 185

x15 30 9030 30x15 120x 8

Learning Objective: To determine whether two given figures are similar, and to use similarity to find missing lengths or angle measures.

.

b. 219

42x6

x621 429x126 378

126 126

x 3

HW – Similar Triangles worksheet

Out – What do we mean by corresponding angles and corresponding sides of similar figures?

Summary – Similar triangles are…

POW!!