Step 1: Remember the AAA congruent theorem

DEFINITION: In two triangles, if the angles are equal, then the sides

opposite to the equal angles are in the same ratio (or proportional) and

hence the two triangles are similar.

Step 2: Find the two triangles with three pairs of congruent angles.

EXAMPLE: \angle P = \angle L

\angle Q = \angle M

\angle R = \angle N

Step 3: Conclude that the given triangles are congruent if the two triangles with

three pairs of congruent angles.

EXAMPLE: three angles of △PQR are congruent to three angles

of △LMN, so these triangles are congruent by the AAA Theorem.