# What is the Circumference of a Circle When the Diameter is 18?

If the diameter is given, let us see how to calculate the circumference of the circle.

## Answer: The circumference of the circle when the diameter is 18 is 56.52 units

Circumference of a circle is = 2 × pi × radius

So, circumference of a circle in terms of diameter = diameter × pi

pi (/(/pi/) is the mathematical constant whose value is approximated to 3.14

Circumference of a circle whose diameter 18

= 18* 3.14

= 56.52