7M: Circumference & Area of Circles

Rudra cuts out a circle with a radius of 20 millimeters. What is the circumference of the circle? Round the answer to the nearest whole millimeter. Use 3.14 for π.

• 106 mm

• 125 mm

• 63 mm

• 126 mm

Find the area of the painting.

• 32 π square inches

• 64 π square inches

• 128 π square inches

• 256 π square inches

What is the area of the shaded inner circle? Use 3.14 for π.

• 28.26 in.²

• 9.42 in.²

• 15.70 in.²

• 25.12 in.²

A circular swimming pool has a radius of 18 feet. Approximately how much plastic is needed to make a pool cover? Use 3.14 for π.

• 113.04 ft.²

• 56.52 ft.²

• 1,017.36 ft.²

• 508.68 ft.²

What is the approximate circumference of the circle? Use 3.14 for π.

• 12.56 in.

• 25.12 in.²

• 50.24 in.

• 25.12 in.

How can the relationship of π be represented using the circle below? Use 3.14 for π.

Which formula can be used to find the circumference of the bicycle wheel? Use 3.14 for π.

The circumference of a circle is C feet. The diameter of the circle is 16 feet. Which expression best represents the value of π?

A piece of fabric in the shape of a circle has a diameter of 24 millimeters. Which measurement is closest to the area of the fabric? Use 3.14 for π.

• 1,808.64 mm²

• 75.36 mm²

• 452.16 mm²

• 150.72 mm²

A circle has a radius of 3.2 feet. Which measurement is closest to the circumference of the circle in feet? Use 3.14 for π.

• 10.05 ft.

• 18.20 ft.

• 32.15 ft.

• 20.10 ft.