Calculate the unknown defining side lengths circumferences volumes or radii of a various geometric shapes with any 2 known variables. For instance we can calculate the surface area of a sphere a cone or even the surface area of a cylinder. Radius or diameter of a base and the height of the cylinder.
Now that you know how to calculate the area of a circle we encourage you to try our other circle calculators.
As we discussed earlier the circle is a two-dimensional figure in most of the cases area and surface area would be the same. Area of a circle p d2 2. A circle has about 80 of the area of a similar-width square. It is interesting to compare the area of a circle to a square.