Front

What is the diameter?

Back

The distance from an edge of a circle to another edge through the center.

Front

What is the radius?

Back

The distance from the center of the circle to an edge of the circle.

Front

What does π represent?

Back

Approximately 3.14, it is the ratio of the circumference of a circle to its diameter.

Front

If the diameter is 16 inches, what is the radius?

Back

8 inches.

Front

If the radius is 9.5 mm, what is the diameter?

Back

19 mm.

Front

What is the circumference of a circle?

Back

The measurement around the circle.

Front

How do you calculate the circumference of a circle?

Back

Circumference = π × diameter.

Front

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

Back

31.4 cm (using π ≈ 3.14).

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

If the radius is 4 cm, what is the diameter?

Back

8 cm.