Area and Circumference of a Circles

Which equation would you use to find the area of a circle?

• 2r

• 1/2d

Which equation would you use to find the circumference of a circle?

• 2r

• 1/2d

What is the circumference of a 12-inch pizza?

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

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

What is the diameter of a circle with a radius of 3 ?

• 3

• 6

• 9

• 12

What is the radius of a circle with a diameter of 10 ?

• 2

• 5

• 10

• 20

• 7

• 9

• 8

• 10

• 6

• 8

• 10

• 12

• 9

• 10

• 11

• 12

• 120

• 60

• 80

• 40