Circumference of a Circle

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter.

Front

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

Back

14 cm.

Front

What is the value of π (pi) approximately?

Back

3.14.

Front

How do you calculate the circumference if you only have the radius?

Back

Circumference = 2 × π × radius.

Front

What is the circumference of a circle with a diameter of 10 ft?

Back

31.4 ft.

Front

What does the term 'radius' refer to in a circle?

Back

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

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

If a circle has a circumference of 62.8 cm, what is its diameter?

Back

20 cm.

Front

What is the diameter of a circle with a circumference of 31.4 ft?

Back

10 ft.

Front

In words, describe the relationship between circumference and diameter.

Back

The circumference of a circle is equal to pi times the diameter.