Area and Circumference of a Circle

  • A circle is defined by the centre and the radius or diameter.


Circle Area and Circumference of a Circle
  • C – circumference
  • A – area
  • r – radius
  • d – diameter
  • O – centre


Enter 1 value

r =
d =

Round to decimal places

Area A =
Circumference C =

Calculation Procedure


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