Area of Circle and Circumference

What is the distance around a circle called?

• the radius

• the diameter

• the circumference

Find the circumference of the circle.

• 4.082 m

• 8.164 m

• 1.32665 m

• 5.3066 m

Find Circumference.

• 87.92 cm

• 43.96 cm

• 21.98 cm

• 3.14 cm

Which is the correct formula for the area of a circle?

• A = π r²

• A = 2π r²

• A=πd

• A=π d²

A circular mirror has a 2 inch frame around it. The mirror itself is 8 inches in diameter. What is the area of the frame? Use 3.14 for pi.

This formula is used to find what?

• Area

• Circumference

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Find the area of each circle when given the circumference.
Circumference = 6π yd

• 6 yd

• 19 yd

• 18.8 yd

• 36 yd

Match the following definitions to the terms:

• square units (units²)

• Circumference of a circle

• How much space a circle takes up

• Area of a circle

• Units of area

• feet, cm, inches

• The distance around a circle

• Units of circumference

Find the circumference of each circle when given the area.
area = 64π mi²

• C =  32 mi

• C = 42.5 mi

• C = 50.3 mi

• C = 64  mi