Ans. Two triangles can be proven congruent using different methods, such as the Side-Side-Side (SSS) congruence criterion, Angle-Side-Angle (ASA) congruence criterion, and Side-Angle-Side (SAS) congruence criterion. These criteria compare the lengths of corresponding sides and the measures of corresponding angles to determine if the two triangles are congruent. If all the corresponding sides and angles are equal, then the triangles are congruent.