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.

This article was originally published with the title “The Circumference of a Circle of Given Radius” in SA Supplements Vol. 72 No. 1860supp (August 1911), p. 135 doi:10.1038 ...

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.