# How to Find the Circumference of a Circle

## Finding the Circumference of a Circle

The circumference of a circle is found using the formula:

In the formula, **d** is the diameter of the circle. The image below shows what we mean by diameter:

## How to Find the Circumference of a Circle

### Question

What is the circumference of a circle with a diameter of 10 cm, as shown below?

### Step-by-Step:

# 1

# 2

Substitute the diameter into the formula. In our example, d = 10.

Circumference = π × 10 = 31.4 cm

### Answer:

The circumference of the circle with a diameter of 10 cm is 31.4 cm.