Mathematics

AAS congruence

AAS सर्वांगसमता

In Class 9 Mathematics, this topic explores the AAS (Angle–Angle–Side) congruence criterion within the chapter on Triangles. Students learn how two triangles can be proved congruent when two corresponding angles and a corresponding non-included side are equal. They practise identifying matching parts, writing clear geometric proofs, using angle relationships, and applying the criterion to determine equal sides or angles in diagrams. The topic strengthens logical reasoning and accurate use of congruence notation.