RD Sharma Solutions for Class 7 Chapter 16 Congruence is all about Congruent Shapes, Congruent Line-segments, Congruent Angles, Congruent Triangles and Conditions for the Congruence of Triangles, etc. When two triangles are congruent, they will have the same three sides and the same three angles. The equal sides and angles may not be in the same position (if there is a turn or a flip), but they are there. Congruence of Triangles are triangles having corresponding sides and angles to be equal. Congruence is the term used to define an object and its mirror image. Two objects or shapes are said to be congruent if they superimpose on each other. Their shape and dimensions are the same. In the case of geometric figures, line segments with the same length are congruent, and angle with the same measure are congruent. But it is necessary to find all six dimensions. Hence, the congruence of triangles can be evaluated by knowing only three values out of six.