To find the area using the radius or the length from the center of the circle to the edge use the formula area pr2 where r is the radius. The formula to find a circles area p radius 2 usually expressed as p r 2 where r is the radius of a circle. The formula for the area of a circle is pi multiplied by the radius of the circle squared.
The radius of a circle calculator uses the following area of a circle formula.
Circle Formula Circle is a particular shape and defined as the set of points in a plane placed at equal distance from a single point called the center of the circle. P is approximately equal to 314. The full angle is 2p in radians or 360 in degrees the latter of which is the more common angle unit. The formula for the area A A of a circle is built around its radius.