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

What does similar mean?

• same shape and same size
• same size
• sames shape
• neither

What does congruent mean?

• same shape and same size
• same size
• sames shape
• neither

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