The checking for right-angled triangles is RHS:
Right angle - they both haver a right angle
Hypotenuse - the hypotenuse of the triangles are congruent
Side - a corresponding side of the triangles are congruent.
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HyL Congruence Theorem : if a leg and the hypotenuse of one right triangle are congruent to a corresponding leg and the hypotenuse of another right triangle,then the triangles are congruent._eytiin cu ;)
The HA and HL theorems for right triangles or the Pythagorean theorem might be of use.
It is a congruence theorem. There are several of them and they are not all numbered the same way.
I assume "throemand" is your fail at spelling "theorem and".The theorem states that if two angles and the included side of one triangle are congruent to the corresponding parts of another triangle, then the triangles are congruent.
The SAS theorem is used to prove that two triangles are congruent. If the triangles have a side-angle-side that are congruent (it must be in that order), then the two triangles can be proved congruent. Using this theorem can in the future help prove corresponding parts are congruent among other things.