A circle is a two-dimensional figure formed by all the points which are the same distance from a center point.

The word circle originates from the Greek word κρίκος (krikos), meaning “hoop” or “ring”.

Humans have long ago recognized circles whereas Natural circles include the shapes of the Sun and Moon, the human eye, tree cross-sections, some flowers, some shells etc.

The longest distance between two points on a circle is the diameter- line segment running through the center.

Do you Know ?

A circle is the shape with the shortest perimeter enclosing an area. The circle is the most symmetric shape as every line through the center is a line of reflection symmetry.


Archimedes proved that the area enclosed within a circle is the same as the area of a triangle with a base the length of the circle’s circumference and height equal to the circle’s radius.

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