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.

You draw a circle. From that circle, you can determine both the circumference and the radius. Then the value of pi would be the circumference divided by twice the radius. Simple, right?

GCSE Edexcel 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.