Area or Circumference

Front

What is the circumference of a circle?

Back

The circumference is the distance around the circle.

Front

What is the area of a circle?

Back

The area is the space contained within the circle.

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle, passing through the center.

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its edge.

Front

If a circle has a diameter of 10 inches, what is its radius?

Back

Radius = diameter ÷ 2, so radius = 10 ÷ 2 = 5 inches.

Front

If a circle has a radius of 4 inches, what is its circumference?

Back

Circumference = 2 × π × radius = 2 × π × 4 ≈ 25.13 inches.

Front

If a circle has a radius of 3 inches, what is its area?

Back

Area = π × radius² = π × 3² ≈ 28.27 square inches.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.