Applying concepts in similarity to perimeter

Problem #6

The two figures are similar. Find the ratios (red to blue) of the perimeters and of the areas. (Select all that apply.)

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

• 14/9

• 9/14

• 196/81

• 81/196

If the ratio of corresponding sides in two similar polygons is 3:5, and one side of the first polygon is 12 units, what is the length of the corresponding side in the second polygon?

• 20

• 24

• 15

• 18

Two polygons are similar. The perimeter of the first polygon is 72 inches. The perimeter of the second polygon is 90 inches. What is the scale factor of the first polygon to the second polygon?

• 72 : 90

• 90 : 72

• 4 : 5

• 5 : 4

The solids are similar. 
Find the missing dimention. 

• 50in
• 25 in
• 12.25 in
• 35.7in

Find the missing perimeter.

• 98

• 112

• 86

• 154

The ratio of the corresponding sides of two similar triangles is 3:5.  What is the ratio of the perimeters of these triangles?

• 5:3
• 9:25
• 3:5
• 6:10

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

• 11/6

• 6/11

• 121/36

• 36/121

What is the ratio of this triangle?

• 3/4
• 2/3
• 1/6
• 8/10

If the ratio of corresponding sides in two similar polygons is 1:3, and one side of the second polygon is 15 units, what is the length of the corresponding side in the first polygon?

• 5

• 2

• 1

• 4