Calculations based on area and perimeter of circle

Circle

A circle is a simple shape in geometry. All points in a plane that are at a given distance from a given point is the centre. The distance between any of the points and the centre is called the radius.

Circle-image

Formulae used

r = radius of circle
Area of circle = πr2 
Circumference of circle = 2πr
Diameter of circle = 2r

Calculate circle's area, diameter and circumference

Formula : Area = πr2

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Area {{avalue}}
Diameter {{dvalue}}
Circumference {{cvalue}}

Calculate circle's radius, circumference and diameter

Formula : Radius = √A / π

Input

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Check your output in all other similar units

Radius {{rvalue}}
Diameter {{dvalue}}
Circumference {{cvalue}}

Calculate circle's radius, diameter and area

Formula : Radius = c / 2π

Input

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Check your output in all other similar units

Radius {{rvalue}}
Diameter {{dvalue}}
Area {{avalue}}
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