Radius :

Diameter :

Circumference :

Area :

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Radius is distance from centre of circle to circumference of the circle

Diameter is distance from one point on circumference to another point in circumference with the line passing through the centre of the circle

Circumference is the total length of outer border of the circle

Area is the total area of the circle

Calculate Others button computes the all other parameters of circle given one of the four parameter

Given any one field value all others can be computed. Change any of the textbox and press enter to compute other fields