WHAT ARE THE PROPERTIES OF CIRCLES?

A circle is the locus of a point which moves in a plane, so that it its distance from a fixed point in the plane is always constant.
The fixed point is called the centre of the circle and the constant distance from the centre to any point on the circle is called its radius.

Fascinating Facts About The Number Pi

i is the most recognized mathematical constant in the world. Mathematicians often consider Pi as the most important and intriguing number in all of mathematics.