If in two right triangles the hypotenuse and one side of one triangle are equal to the hypotenuse and one side of the other triangle, then the two triangles are congruent. This is Known as [[1]] Congruency.

The Right Angle-Hypotenuse-Side (RHS) congruence criterion is a congruence criterion (full form of RHS congruence).

According to the RHS congruence theorem, two right-angled triangles are congruent if their hypotenuses and sides are equal.