Area and Circumference of Circles Review

If you are going to paint the entire center circle of a basketball court, do you need to know the area or circumference of the circle?

• Area

• Circumference

• Neither

In circle O, the radius is 4, and the measure of minor arc AB is 120 degrees. Find the length of minor arc AB to the nearest integer.

• 5

• 9

• 8

• 6

Find the area of the shaded space.

• 113.10 units squared

• 150.80 units squared

• 157.82 units squared

• 10.92 units squared

Find the area of the shaded sector

• 173.42 cm²

• 212.06 cm²

• 237.50 cm²

• not enough information

What is the arc length of minor arc AB?

• 5.23

• 103

• 33.33

• 50

What is the formula to calculate the area of a circle?

• A = πr²

• A = 2πr

• A = 3r²

• A = 4πr

If the radius of a circle is 5 cm, what is its area?

• 10.24 cm²

• 15.7 cm²

• 25.12 cm²

• 78.54 cm²

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

• 72 square meters

• 56.52 square meters

• 24 square meters

• 113.04 square meters

Calculate the area of a circle with a diameter of 8 inches.

• 64 square inches

• 100.48 square inches

• 50.24 square inches

• 16 square inches

If the area of a circle is 81 square units, what is its radius?

• 7 units

• 9 units

• 20 units

• 5 units