Similar Polygons and Proportionality

Rectangles ABCD ~ EFGH with a scale factor of 3:7. What's the scale factor of of their perimeters EFGH to ABCD?

• 3:7

• 7:3

• 10:3

• 7:10

Two similar triangles have the scale factor 5:4. Find the ratio of their corresponding altitudes.

• 10:4

• 5:2

• 4:5

• 5:4

Find x.

• 18

• 21

• 11.8

Find x.

• 147

• 21

• 24.5

Find x.

• 11

• 55

• 275

Find x.

• 45

• 9

• 5

• 15

Complete each proportion.
AB / BM  =  ? / CD

• BC

• AC

• MD

• MC

Select the proportion that shows the Triangle Proportionality Theorem.

In ΔABC, D and E are points on sides AB and AC respectively such that DE|| BC and AD : DB = 3 : 1. If EA = 3.3cm, then AC=_______

• 1.1 cm

• 4cm

• 4.4cm

• 5.5cm

ΔABC and ΔPQR are similar triangles such that ∠A = 32° and ∠R = 65°, then ∠B is :

• 83°

• 32°

• 65°

• 97°