Calculate the radius of circle is the distance from center of the circle to circumference of a circle. Circumference is the outside of a circle perimeter.

It is having same distance from middle point of a circle to perimeter of circle.

If you draw a circle based up on the center point then calculate the radius of a circle by using three ways to find the radius of a circle.

The three different formulas are based on diameter, area and circumference of a circle.

**Calculating the radius of circle if you know the diameter**