How to Solve for Radius in Excel. The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference.

The circumference of a circle is its outside edge, and is the same distance from the centre at every point along its length. This distance is called the radius.

Learn about and revise circles and their properties such as circumference and radius with this BBC Bitesize GCSE Maths Eduqas study guide.