Save guides, add subjects and pick up where you left off with your BBC account. The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate ...

It is another name for the perimeter of a circle. The circumference of a circle is calculated using the formula: \(\text{circumference} = \pi \times \text{diameter}\) This number is Pi.

But math is all around us. In the book Elementary Algebra for College Students, Allen R. Angel discusses the formula for area and circumference, which you can use to measure a hockey puck (144).