Table of Contents

**Circles – Definition, How to Draw a Circle, Properties of a Circle, Formulas**

## What is a Circle?

A circle is a plane figure bounded by a curved line, called the circumference, that is everywhere equidistant from a point within it, called the center.

**Circle Definition**

A circle is a simple closed curve that is created by a point moving around another point at a fixed distance. The distance between the two points is called the radius of the circle. Circles are two-dimensional shapes and have no thickness.

### How to Draw a Circle?

To draw a circle, first draw a dot in the center of the paper. Next, use a ruler to draw a line from the dot to the edge of the paper. Finally, use a compass to draw a circle by drawing a line from the dot to the edge of the paper, and then drawing a second line from the dot to the edge of the circle.

#### Terms Related to a Circle radius

The radius of a circle is the distance from the center of the circle to its edge.

## Properties of a Circle

A circle is a plane figure with all points on it equidistant from the center.

A circle has 360 degrees.

A circle has a circumference.

A circle has a radius.

## Formulas Related to a Circle

There are a few formulas related to circles that are important to know.

The area of a circle is πr2, where r is the radius of the circle.

The circumference of a circle is 2πr, where r is the radius of the circle.

The diameter of a circle is 2r, where r is the radius of the circle.

## Related to Circles

In geometry, a circle is a simple closed shape. It is the set of all points in a plane that are at a fixed distance from a given point, the centre. The distance between any of the points and the centre is called the radius.