NOT UNDERSTOOD THE RHS CONDITION. PLEASE EXPLAIN IN A SIMPLE LANGUAGE?

RHS stands for Right-Hypotenuse-Side.

Two right-angled triangles are said to be congruent by RHS congruence rule if the hypotenuse and one side of one right-angled triangle is equal to the hypotenuse and one side of the other right-angled triangle.

Thus, to prove two triangles to be congruent by RHS rule, we must have two right angled triangles whose one side and hypotenuse of one triangle are equal to the one side and hypotenuse of the other triangle.