Learn about the definition of pi in relation to a circle with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

In particular, after a quick refresher of circle basics, we’re going to figure out why the equation for the circumference of a circle that we all learned in school works, and we’re also going ...

Circles, sectors and arcs - Edexcel Circumference of a circle. The circumference of a circle is its outside edge, and is the same distance from the centre at every point along its length.