https://www.khanacademy.org/math/geometry-essentials/x4ed6fe35e53aafaa:congruence 2026-06-30T17:30:43.834984468Z Congruence Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about triangles and parallelograms. unit