Area and Diameter of a Circle

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

• πr

• 2πr

• πr^2

• 2πr^2

What is the area of this circle?
d = 8cm

• 16π

• 8π

• 4π

• 36π

Shring's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

Round to the nearest tenth.

If the diameter is 10, what is the circumference?

• 15.70796327

• 31.41592654

What is the diameter?

• 8

• 16

• 10

• 4

The diameter of circle L is 20 units and the diameter of circle M is 13 units and QR = 4. Find LQ.

• 16 units

• 6 units

• 14 units

• 9 units

A tire has a radius of 14 inches. What is its diameter?

• 14 inches

• 7 inches

• 28 inches

A pond has a diameter of 12 feet. What is its radius?

• 12 feet

• 6 feet

• 24 feet

Serena drew a circle with a circumference of 157 centimeters. What is the approximate diameter of the circle she drew?

• 1.57 cm

• 50 cm

• 15.7 cm

• 25 cm

What is the area of this circle?

• 28.26 cm²

• 28.26 cm

• 9.42 cm²

• 9.42 cm