Circumference

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

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

Back

The diameter is 14 cm (diameter = 2 x radius).

Front

What is the formula for calculating the circumference of a circle?

Back

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

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

The radius is 5 cm (Circumference = 2 x π x radius).

Front

What does a radius of 12 inches represent in a circle?

Back

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

Front

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

Back

The circumference is approximately 31.42 inches (Circumference = π x diameter).

Front

What is the relationship between diameter and radius?

Back

The diameter is always twice the length of the radius.

Front

If a circle has a circumference of 62.83 cm, what is its diameter?

Back

The diameter is 20 cm (Diameter = Circumference / π).

Front

What is the perimeter of a circle also known as?

Back

The perimeter of a circle is also known as the circumference.

Front

If the radius of a circle is 9.5 inches, what is the diameter?

Back

The diameter is 19 inches (diameter = 2 x radius).