Area of Circles

Find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

What is/are the formula(s) to find the area of a circle?

• πr²

• 2πr

• √π

Find the area of the composite figure.

• 100

• 400

• 137.5

• 175

A circle as an area of 36π meters². What is the radius of the circle?

• 36 meters

• 6 meters

• 12 meters

• 18 meters

A rose garden is circular. The diameter of the garden is 18 feet. What is the area of the garden?

• 9π square feet

• 36π square feet

• 81π square feet

• 18π square feet

A circle as an area of 64π meters². What is the diameter of the circle?

• 64 meters

• 16 meters

• 8 meters

• 4 meters

What is the diameter of the circle in the image?

• 10

• 20π

• 20

• 100

Which number does π represent?

• 3

• 3.14

• 3.2

• 3.54

What is the radius of the circle in the image?

• 6 inches

• 9 feet

• 3 inches

• 12 feet

Find the area. Round your answer to the nearest tenth.

• 62.9 in

• 31.4 in

• 1256.6 in²

• 314.2 in²