# Center of a Circle

A Circle is defined as the locus of all points which are equidistance from a point. The point is called the Centre of the circle. So, the Centre of a Circle is a point which lies inside the circle and is at equidistance from all the points on the circumference of the circle. A circle is named by the centre of a Circle.

The constant distance from the centre of the circle to any point on the circumference of the circle is called the radius of the circle. The Diameter of the circle is the line segment that joins any two points on a circle and that passes through the centre of the Circle.

In the circle on the left, “A” is the centre of the circle. B, C, D are three points on the circumference of the circle which are at equidistance from A. Thus AB, AC, AD are all the radii.

CD becomes the diameter of the Circle. The diameter of the circle is twice the radius of the circle. So, CD = 2r.

Real World Examples: Few real world examples of a circle are a wheel in which wheel hub is the centre, a pizza is cut from its centre, flowers with pollen.