**This Section explains how you can calculate the radius of a given circle**
The radius of a circle can be calculated if the coordinates of the mid point and a point on circumference are known. If the two points are (x1, y1) and (x2, y2), the radius is the distance between these points. This distance can be calculated by using the following formula:

The above formula is very handy in Mathematics. Students should be aware of this formula in order to get a good grip in the subject.