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# Circumference Formula

Circumference of a circle is the measure of the boundary of a circle. It is defined as distance covered by the closed curve of the circle. The Circumference Formula requires either the radius or the diameter of the circle for its calculation.

The Circumference Formula is given as,

Where,
C is the circumference of the circle.
d is the diameter of the circle.
r is the radius of the circle.

 Related Calculators Circumference Formula Calculator Circumference and Area of a Circle Circumference Diameter Calculator Circumference of an Ellipse Calculator

## Circumference Problems

Some solved problems on circumference of a circle are given below:

### Solved Examples

Question 1: Find the circumference of the circle whose radius is 13 cm ?
Solution:

Given,
Radius of the circle = r = 13 cm

Circumference of the circle
= 2πr
= 2 $\times$ π $\times$ 13 cm
= 81.681 cm

Question 2: Find the circumference of the circle whose diameter is 27 cm ?
Solution:

Given,
Diameter of the circle = d = 27 cm

Circumference of the circle
= πd
= π $\times$ 27 cm
= 84.823 cm

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