Area Using Similar Figures

Find the missing area. 

• 0

• 12

• 24

• 30

Find the missing area.

• 15

• 20

• 25

• 30

The scale factor from figure A to figure B is 4.  How many times larger is the area of B than the area of A?

• 4

• 16

• 8

• 2

Find y.

• 144

• 18

• 72

• 12

The figures below are similar. The labeled sides are corresponding.

What is the ratio of the areas of the smaller pentagon to the larger pentagon?

• 9:5

• 25:81

• 5:9

• 81:25

Find the ratio (red to blue) of the area.

• 11/6

• 6/11

• 121/36

• 36/121

A tree is 12 feet tall and casts a shadow 9 feet long. A building nearby casts a shadow that measures 24 feet. How tall is the building? (Draw a picture, set up a proportion)

• 24 feet

• 21 feet

• 27 feet

• 32 feet

Solve for X.

• 2 ft

• 3 ft

• 4 ft

• 6 ft

If ΔGFE~ΔCBE, find the value of x. 

• x=9

• x=18

• x=36

• x=1.2

Identify the perimeter and area ratios for the following figures.

• Per. Ratio=8  Area Ratio=64

• Per. Ratio=8/48  Area Ratio=64/2304

• Per. Ratio=8/48  Area Ratio=8/48

• Per. Ratio=8/48  Area Ratio=2304/64