Equation of a Circle Circumference Area

A DVD has a diameter of 15 millimeters. Which equation would help you determine the circumference?

• c = 15π

• c = 2π15

• c = π(15²)

• c = π(7.5²)

Tags

CCSS.7.G.B.4

The diameter of Carol's old records from the 80s is 12 inches. Which equation would help you determine the area?

• A = 12π

• A = 2π12

• A = π(12²)

• A = π(6²)

Tags

CCSS.7.G.B.4

A circle has a radius of 5 cm. What is the area?

• 78.5 cm²

• 31.4 cm²

• 15.7 cm²

• 314 cm²

Tags

CCSS.7.G.B.4

The diameter of the wheel on a bicycle is 24 inches. Which is closest to the circumference of the wheel?

• 25.36 in

• 37.68 in

• 75.36 in

• 452.16 in

Tags

CCSS.7.G.B.4

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

• A = πd

• A = 2πr

• A = πr²

• A = xyz

Tags

CCSS.7.G.B.4

What is the area of a circle?

• The distance around a circle.

• The space inside the circle.

• A line from side to side passing through the center.

• A line from the center to the side.

What is the distance around the bowl?

• 21.98 cm

• 43.96 cm

• 87.96 cm

• 7 cm

Tags

CCSS.7.G.B.4

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

What is the area of this circle?

• 50.27 cm²

• 78.23 cm²

• 98.12 cm²

• 201.06 cm²

Tags

CCSS.7.G.B.4

A DVD has a diameter of 15 millimeters. Which equation would help you determine the area?

• A = 15²π

• A = 2π15

• A = 7.5²π

• A = 15 π

Tags

CCSS.7.G.B.4