SSS (Side-Side-Side)

The Side-Side-Side (SSS) criterion is a method used in geometry to determine if two triangles are exactly the same shape and size, called congruent. If all three sides of one triangle are equal in length to the three sides of another triangle, then the triangles are congruent. This means they can be perfectly overlaid, matching exactly without rotating or resizing. SSS is a reliable way to prove congruence because knowing all three sides match ensures all angles and the overall shape are identical.