Which of the following examines the congruence of plane figures? 

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. 

The congruence of planar figures, line segments, and angles is investigated using the superposition method. When two plane figures are placed on each other, they cover it exactly.