Circle in Geometry

A Circle is a simple closed shape. From a certain point called the centre, all points of a circle are of same consistent distance, i.e. the curve traced out by a point that moves so that its distance from the centre is constant.

Similarity and Congruency in Geometry

Similarity – Two figures are said to be similar if they have the same shape or have an equal angle but do not have the same size.

Congruence –  Two figures are said to be Congruent if they have the same shape and size. Thus, they are totally equal.