if two angles of a triangle are congruent, then the sides
If two angles and the included side of a triangle are congruent to the corresponding angles and sides in a second triangle, then the two triangles are congruent. Now Solve This 1.1. 1. Prove converse of Theorem 1.3. If two angles of a triangle are congruent, then the sides opposite those angles are congruent. In the proof of the converse of Theorem 1.3 we now have the ASA congruence as well as the SAS to use in the proof. 2. Prove an equilangular triangle is equilateral This one is clear.