Effects of Scale Factor on Perimeter and Area

A picture of a school’s mascot is 18 in. wide and 24 in. long. It is enlarged proportionally to banner size. If the width is enlarged to 63 in., what is the length of the banner?

• 84 in

• 71 in

• 47.25 in

• 80

The scale drawing for Zoe's room is shown. If 1 in on the scale drawing equals 3 feet. What is the area for Zoe's room?

• 49  square feet

• 132 square feet

• 126 square feet

• 14 square feet

If AB = 3 and the scale factor is 4 then how long is A'B'?

The projection screen in the school auditorium is 2 times as long and 2 times as wide as the screen in the library. The screen in the library is 3 feet long with a perimeter of 12 feet. What is the perimeter of the screen in the auditorium?

• 48 feet

• 24 feet

• 4 feet

• 16 inches

• 63/4 and 4/ 
• 1/8 and 1/64
• 8 and 1/8
• 8 and 64

Choose the correct scale factor:

• 2

• 3

• 1/3

• 1/2

The two rectangles are scale drawings. What is the measurement of x?

• 21

• 1.25

• 20

• 4

If the scale factor is 4, what is the measurement of x?

• 20 m

• 24 m

• 16 m

• 4 m

Marcus’s favorite casserole recipe requires 3 eggs and makes 6 servings. Marcus will modify the recipe by using 5 eggs and increasing all other ingredients in the recipe proportionally. What is the total number of servings the modified recipe will make?

• 6

• 8

• 10

• 12

• 15

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

• 11/6

• 6/11

• 121/36

• 36/121