Who discovered the congruence of triangle?

The congruence of triangles is a fundamental concept in geometry, and it wasn't discovered by a single individual but rather developed over time through the work of various mathematicians. Ancient Greek mathematicians, particularly Euclid in his work "Elements," laid the groundwork for understanding triangle congruence through postulates and theorems. The criteria for triangle congruence, such as Side-Side-Side (SSS) and Angle-Side-Angle (ASA), were formalized later as geometry evolved.