Step 1: Remember the ASA congruent theorem

DEFINITION: The **Angle Side Angle Postulate (ASA)** says triangles are congruent if any two angles and their included

side are equal in the triangles. An included side is the side between two angles.

Step 2: Find the two triangles with two pairs of congruent angles and congruent **included** sides.

EXAMPLE: **A**ngle ∠Q ≅ ∠D

** S**ide QS ≅ CD

** A**ngle ∠S ≅ ∠C

Step 3: Conclude that the given triangles are congruent if the two triangles with two pairs of congruent angles and congruent **included** sides.

EXAMPLE: Two angles and the included side of △QRS are congruent to two angles and the included side of △CDE,

so these triangles are congruent by the ASA Theorem.