A circle is a shape with all points the same distance from the center. It is named by the

center. The center of a circle is a point.

Let r is the radius of the circle and O is the center of the circle.

Now, the distance around a circle is called the circumference.

The circumference of the circle = 2πr

π is the ratio of the circumference of a circle to the diameter. 

=> π = circumference of the circle/diameter of the circle 

The value of π = 22/7 = 3.142....