Circumference

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

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

Back

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

Front

If the diameter of a circle is 14 cm, what is its circumference?

Back

Circumference = π × 14 cm ≈ 43.96 cm.

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 circumference.

Front

If the radius of a circle is 6 cm, what is the diameter?

Back

Diameter = 2 × radius = 2 × 6 cm = 12 cm.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is the circumference of a circle with a radius of 5 cm?

Back

Circumference = 2 × π × 5 cm ≈ 31.42 cm.

Front

What does 'perimeter' mean in relation to shapes?

Back

The total distance around the outside of a shape.

Front

If a circle has a circumference of 31.42 cm, what is its radius?

Back

Radius = Circumference / (2 × π) ≈ 5 cm.

Front

What is the diameter of a circle with a circumference of 62.83 cm?

Back

Diameter = Circumference / π ≈ 20 cm.