The area of a circle knowing the radius online calculator


Online calculator which will help you to find the area of a circle knowing the radius.
Circle – this locus of points in the plane whose distance from a to a given point called the center of the circle does not exceed a given number called the radius of this circle if the radius is zero the circle degenerates to a point.
The radius of the circle is a segment connecting the center of the circle and any maximally remote from the center point of the circle.
The area of this circle is calculated by the formula (S = π * r2), where S is the area of a circle, r is the radius of the circle number π = 3,14 approx.

Specify the radius of the circle
r:

Result:
S =
Нахождение площади круга зная радиус.