What is radius formula?

The radius of a circle is the distance from the center of the circle to any point on the circle. It is often denoted by the letter r.

r = d / 2

where r is the radius, d is the diameter, and √ is the square root symbol.

The radius can also be calculated using the circumference of the circle (C):

r = C / 2π

where C is the circumference and π (pi) is a mathematical constant approximately equal to 3.14159.