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Area of a circle, circle area formula calculator

Area of a circle, circle area formula calculator allows you to find an area of a circle (circumference), by the formula, using radius or diameter of circle.

Method of calculating the area of a circle:
Radius: Diameter:


A circle is the set of all points in a plane that are at a given distance from a given point, the centre. Formula for area of a circle , where r - circle radius, d - diameter A circle is the set of all points in a plane that are at a given distance from a given point, the centre. Formula for area of a circle , where r - circle radius, d - diameter

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Find an area of a square, by the formulas, using length of square sides or diagonal.
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