### What is a Circumference?

Prior to discussing how to calculate circumference from diameter, let us define what it is. Circumference of a circle or perimeter of a circle is the length of the complete arc of a circle. That is, the circumference would be the length of the circle if it were opened up and straightened out to a line segment.

In addition, circumference is represented by the uppercase letter C and it is measured in terms of units of length like centimeters, meters, or kilometers.

### What is a Diameter?

Diameter is a chord or a straight line segment that runs through the center point of any circle and touches two points on the circumference of a circle. It is the longest possible chord of any circle.

Additionally, a circle’s diameter essentially splits the shape in half.

### Why is Calculating the Circumference from Diameter Useful?

- Architects use the circumference concept when looking at materials for their projects,
- Also its used a lot in farming for fencing and looking at crop yields.
- Because the circumference measures a distance around something, it’s an invaluable tool for lots of work that involves area, shape, and measurement.

### Formula to Calculate the Circumference from Diameter.

Finding the circumference of a circle is quick and easy. If you know the length of the diameter of any given circle, then you can calculate its circumference.

π is a special mathematical constant with a value estimated to be 3.142 or

**Example 1:**

Calculate the circumference of a circle whose diameter is 14 m.

Therefore, the circumference of the circle is 43.988 m.

**Example 2:**

Find the circumference of the circle, if the diameter given is 35cm long.

Hence, the the circumference of the circle is 110cm.