Area and Circumference

Front

What is the circumference of a circle?

Back

The distance around the circle.

Front

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

Back

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

Front

What is the diameter of a circle?

Back

A line through the center of a circle that touches two points on the circle.

Front

What is the radius of a circle?

Back

The distance from the center of the circle to any point on the circle.

Front

If the radius of a circle is 7 cm, what is the circumference?

Back

Circumference = 2 × π × 7 cm ≈ 43.96 cm.

Front

If the diameter of a circle is 10 cm, what is the circumference?

Back

Circumference = π × 10 cm ≈ 31.4 cm.

Front

What is the area of a circle?

Back

The space contained within the circle.

Front

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

Back

Area = π × radius².

Front

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

Back

Area = π × 5² cm² ≈ 78.5 cm².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.