Chapter 7 Proportions and Similarity

Given the choice between doing an oral and a written report, 18 of the 28 students chose to do an oral report. Find the ratio of written to oral reports

• 5:9

• 9:5

• 9:14

• 14:9

A model of a lighthouse has diameter 8 inches and height 18 inches. If the actual diameter of the lighthouse is 20 feet, find its actual height.

• 30 ft

• 35 ft

• 45 ft

• 50 ft

The three sides of a triangle are in the ratio 2:4:5. If the shortest side of the triangle is 4 meters long, find the perimeter.

• 17 m

• 22 m

• 32 m

• 40 m

Find the polygon that is similar to ABCD.

• 
• 
• 
• 

If △ABC ∼ △DEF, find m∠C.

• 54

• 59

• 67

• 69

Quadrilateral JKLM ∼ quadrilateral WXYZ, JK = 15, LM = 10, XY = 6, and WX = 9. Find KL.

• 8

• 10

• 11

• 12

△LMN ∼ △RST, LN = 21, MN = 28, and the scale factor of △RST to △LMN is .

• 15 3/4

• 21

• 28

• 37 1/3

Name the theorem or postulate that can be used to prove that these triangles are similar.

• AA Similarity

• SAS Similarity

• SSA Similarity

• SSS Similarity

Identify the similar triangles.

• △LMN ∼ △MPQ

• △LMN ∼ △QMP

• △LMN ∼ △QPM

• △LMN ∼ △PQM

Find LM.

• 16

• 17

• 18

• 20