Area and Circumference of a Circle

Circles: Perimeter & Area

By Dean Lollis

Multiple Choice

This is a line that goes from the center of a circle out to any point on the edge of a circle.

• Radius

• Diameter

• Arc

• Ray

Multiple Choice

If a circle has a radius of 20, then the diameter is 10.

• True

• False

Multiple Choice

A circle has a diameter of 36 ft. What is the radius?

• 18

• 72

• 14

Multiple Choice

Find the radius of a circle who's diameter is 40 ft.

• 40ft
• 80ft
• 20ft
• 45ft

Multiple Choice

Which of the following is NOT a formula to find the circumference of a circle.

• $$C=\pi d$$

• $$C\ =\ 2\pi r$$  

• $$C=\pi r^2$$  

Multiple Choice

What is the circumference of this circle?

• 78.5 m

• 31.4 m

• 15.7 m

• 3.14 m

Multiple Choice

What is the radius of this circle?

• 18 in

• 36 in

• 9 in

• 8 in

Multiple Choice

The perimeter of a circle is also known as the ______of the circle

• area

• arc

• circumference

Multiple Choice

What is the circumference of a 12-inch pizza?

• 37.68 inches
• 18.84 inches
• 113.04 inches
• 432.16 inches

Multiple Choice

The Jones family wants to enclose their circular garden with a fence. What is the minimum length of fencing they need to buy?

• 56.25 ft

• 246.2 ft

• 365.56 ft

• 392.5 ft

Multiple Choice

Find the area of the circle, round to nearest tenth:
r = 12 in

• 452.2 in²
• 45.2 in²
• 113.0 in
• 450 in²

Multiple Choice

Find the area of the circle, round to nearest tenth:
r = 2.6 ft

• 2.12 ft²
• 22 ft²
• 5.3 ft²
• 21.2 ft²

Multiple Choice

Find the area of the circle, round to nearest tenth:
r = 18 yd

• 1017.4 yd²
• 10.174 yd²
• 1020 yd²
• 254.3 yd²

Multiple Choice

What is the approximate value of $$\pi$$  ?

• 3

• 3.14  $$\ldots$$  

• 3.5 $$\ldots$$  

• 2.71828 $$\ldots$$  

Multiple Choice

Calculate the area to nearest tenths place.

• 12.6

• 25.1

• 16

• 50.3

Multiple Choice

Calculate the area to the nearest tenths place.

• 36

• 113.1

• 37.7

• 18.8