circumference of a circle formula

Let us learn about circumference of a circle formula

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The distance around the circle is called the Circumference. π is the ratio of the circumference of a circle to the diameter. This relationship is expressed as formula for circumference of a circle = C/d = π, here C = circumference, d = diameter

There are two equivalent formulas for arriving to the circumference of a circle one using the diameter and the other using the radius of the circle. They are :

1. Circumference = π * d (d= diameter)

2. Circumference = 2 * π * r (r = radius)

The π value is usually taken as 3.14

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1.The diameter of a circle is 6 cm. What is the Circumference?

Solution:

Given, diameter = 6cm or radius = d/2 = 6/2 = 3cm

We have, Circumference = π * d (π=3.14)

= 3.14 * 6

= 18.84 cm Answer

OR

Circumference = 2 * π * r (π= 3.14)

= 2 *3.14 * 3

= 3.14 * 6

= 18.84 cm Answer