Circle-Geometry Formulas


A circle is a particular shape of the objects. A circle is a type of closed shape. It is the set of all points in a plane that are at a given distance from a given point. So, it is the curve traced out by a point that moves in a plane in such a way so that its distance from the given point is constant.


r the radius of the circle.

d the diameter of the circle.

C circumference of the circle.

Diameter of the Circle

D = 2 × R

Circumference of the circle

C = 2 × π × R


Find the circumference of a circle whose radius is 10 cm.


Circumference, C = 2πr

= 2 ×3.14×10

= 62.8 cm

Area of the circle:

A = π × R2


Find the area of a circle whose radius is 10 cm


Area = 3.14 × 102

= 314 cm2

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