Circumference of a Circle

Table of Contents

• Circumference
• Calculating Circumference
• Summary
• What’s Next?

In the previous segment, we learnt about the regions of a circle. In this segment, we will learn about the Circumference of a circle.

What is Circumference of a circle?

The distance along the boundary of a circle is the Circumference of the circle. In other words, it is the total length of the boundary.

For example, if an athlete starts at a point on a circular track, then, the distance he covers around the track to reach the same point again is the circumference of the track.

Circumference of a circle

How is circumference calculated?

To calculate the circumference, the radius of the circle is required.

For a circle with radius equal to ‘r’ units, the circumference is given by the formula:

Circumference = ???

The symbol \pi is used to represent Pi.

Summary

Circumference

The distance a along the boundary of circle