Mastering Circles: Area, Circumference, Arcs

Calculate the circumference of a circle with a diameter of 10 m.

• 31.42 m

• 40.84 m

• 15.70 m

• 25.12 m

If a circle has a radius of 5 inches, what is its area?

• 25π square inches

• 20π square inches

• 15π square inches

• 30π square inches

Find the circumference of a circle with a radius of 4.5 feet.

• 25.12 feet

• 31.42 feet

• 20.00 feet

• 28.27 feet

A circle has an area of 78.5 square meters. What is its radius?

• 10 meters

• 3 meters

• 5 meters

• 7 meters

Determine the length of an arc that subtends a central angle of 60 degrees in a circle with a radius of 3 m.

• 2 meters

• 3π meters

• 5 meters

• π meters

What is the area of a circle with a diameter of 12 cm?

• 24π cm²

• 36π cm²

• 36 cm²

• 48 cm²

Calculate the circumference of a circle with a radius of 8 inches.

• 25.12 inches

• 40.84 inches

• 62.83 inches

• 50.27 inches

If the circumference of a circle is 31.4 cm, what is its radius?

• 3 cm

• 5 cm

• 10 cm

• 7 cm

A sector of a circle has a radius of 10 cm and a central angle of 90 degrees. What is the area of the sector?

• 30π cm²

• 15π cm²

• 20π cm²

• 25π cm²

Find the length of an arc in a circle with a radius of 6 m and a central angle of 120 degrees.

• 6π m

• 8 m

• 4π m

• 10 m