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

Where,

C is the circumference of the circle.

d is the diameter of the circle.

r is the radius of the circle.

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 |

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

Given,

Radius of the circle = r = 13 cm

Circumference of the circle

= 2πr

= 2 $\times$ π $\times$ 13 cm

= 81.681 cm

Given,

Diameter of the circle = d = 27 cm

Circumference of the circle

= πd

= π $\times$ 27 cm

= 84.823 cm