# 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.

Circumference of a circle = 2 × pi × radius

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

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

Circumference of a circle whose diameter is 18

= 18 × 3.14

= 56.52

Therefore, the circumference of the circle when the diameter is 18 is 56.52 units.

## What is the circumference of a circle when the diameter is 18?

**Summary:**

The circumference of the circle when the diameter is 18 is 56.52 units.

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