Circumference and Area of Circles Pretest

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

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

• c = 15π

• c = 2π15

• c = π(15²)

• c = π(7.5²)

Mrs. Apple just bought a new dinning room table. She needs to make a table cloth for decoration. What amount of fabric should she buy if the table has a diameter of 5 feet? Choose the equation that would best help solve this problem.

• C = π5

• C = (2)(π)(2.5)

• A = π5²

• A = π2.5²

A ball has a circumference of 9.42 cm. What is the diameter?

• 29.5788 cm

• 59.1576 cm

• 3 cm

• 1.5 cm

Here is a picture of a Ferris wheel. It has a diameter of 80 meters.How far does a rider travel in three complete rotations around the Ferris wheel?

• 753.6 meters

• 251.2 meters

• 125.6 meters

• 376.8 meters

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

What is the diameter?

• 5 in

• 10 in

• 3.14 in

• 15.84 in

Steven purchases a bowl. The diameter of the bowl is 14 cm. What is the circumference of the bowl?

• 28 cm

• 43.96 cm

• 87.96 cm

• 7 cm

What is the area of this circle?

• 6082.12

• 1519.76

• 1893.14

• 1292.92

What is the circumference of a circle with a radius of 54 m?

• 339.12 m

• 169.56 m

• 84.78 m