Circumference & Area of Circles

A DVD has a diameter of 15 millimeters. Which equation would help you determine the distance around the DVD?

• C = 15π

• A = π7.5²

• A = 15 ÷ π

• C = 7.5π

find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm

• 30 mm

• 25.3 mm

• 34.54 mm

what is the area of a circle with the diameter of 16 cm ?

• 66 cm

• 200.96 cm

• 66.5 cm

• 10 m

Radius: 11 feet
Circumference:

• 11

• 379.94

• 34.54

• 69.08

If the diameter of a circle is 50 yards, the radius is _____

• 100 yards

• 25 yards

• 150 yards

• 15 yards

What is the diameter?

• 8

• 16

• 10

• 4

A circle has a radius of 5 cm. What is the area?

• 78.5 cm²

• 31.4 cm²

• 15.7 cm²

• 314 cm²

The diameter of a quarter is 24.26 mm. What is closest to the circumference of the outer edge of the quarter? Use 3.14 for Pi.

• 76.18 mm

• 38.01 mm

• 463 mm

• 1,848 mm

The radius of this pizza is 9 ½ in. What is the approximate area of the pizza?

• 81 in²

• 29.83 in²

• 59 ⅔ in²

• 283 ½ in²