COnsider the figure,
Two triangles are said to be congruent if all their three sides and three angles are equal.
SInce angle K and N are both right angles, we have,
[tex]<\text{MKL}=<\text{MNL}[/tex]
The side ML is the shared side, and hence equal for both the triangles.
SInce LM bisects angle KLN, we have,
[tex]<\text{KML}=<\text{NML}[/tex]
Thus, from AAS theorem ( stands for Angle-angle-side), when two angles and a non-included side of a triangle are equal to the corresponding angles and sides of another triangle, then the triangles are said to be congruent.
Hence the triangles are congruent.
