Perimeters and Areas of Similar Figures

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

• 11/6

• 6/11

• 121/36

• 36/121

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

• 9/14

• 14/9

• 196/81

• 81/196

The scale factor of two similar figures is 4 : 5. What is the ratio of their perimeters?

• 4 : 5

• 16 : 25

• 64 : 125

• 8 : 10

If the ratio of 2 round dinner plates is 2 : 5, what is the ratio of their areas?

• 2 : 5

• 1 : 5

• 4 : 10

• 4 : 25

Two hexagons are similar with a scale factor of 4/5. If the area of the larger hexagon is 20, what is the area of the smaller hexagon?

• 10.24

• 12.8

• 16

• 25

The area of triangle A is 54 and triangle B is 150. What is the scale factor of A to B? 

• 9:25

• 27:75

• 3:5

• 25:9

Find the missing perimeter.

• 15

• 20

• 25

• 30

What is the area ratio of the following rectangles?

• 10/7

• 100/49

• 100/36

• 4/36

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

What is the area of the larger square?

• 25 m²

• 1.25 m²

• 20 m²

• 16 m²

The figures shown are similar. The areas of each figure is given.

What is the ratio of the side length of the smaller triangle to the larger triangle?

• 4:49

• 2:7

• 1:7

• 1:25