Circumference

Front

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

Back

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

Front

If the radius of a circle is 12.5 mm, what is the circumference?

Back

78.5 mm.

Front

What is the difference between diameter and radius?

Back

Diameter is twice the length of the radius. Radius is half the diameter.

Front

What is the circumference of a circle with a radius of 9 meters?

Back

56.52 meters.

Front

What does the term 'circumference' refer to?

Back

The distance around the edge of a circle.

Front

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

Back

5 cm.

Front

How do you find the diameter if you know the circumference?

Back

Diameter = Circumference / π.

Front

What is π (pi) approximately equal to?

Back

3.14.

Front

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

Back

5 cm.

Front

What is the circumference of a circle with a diameter of 20 cm?

Back

62.8 cm.