Circles - Intermediate & Higher tier – WJEC Circumference of a circle Circles are 2D shapes with one side and no corners. The circumference is always the same distance from the centre - the radius.

In the book Elementary Algebra for College Students , Allen R. Angel discusses the formula for area and circumference, which you can use to measure a hockey puck (144).

The formula for the area of the circle is 𝑨 = π𝒓². To work out the area of a circle: Find the value of the radius. If the diameter is given, this must be halved.