Congruence to Simple Geometrical Shapes
The two figures which are same in shape and size are called congruent figures and the relation of two figures being congruent is called congruence.
The symbol to denote congruence is ≅.
Congruent line segments
Two line segments are congruent if both have the same length.
Two circles are congruent if both of them have the same radii.
Two triangles are congruent if both of them have the same length of sides.
Two rectangles are congruent if both of them have the opposite sides are equal.
Thus, the method of comparing two figures is known as the method of superposition.