Why does the ll theorem hold for proving right triangles congruent?

Triangles, considering congruent triangles, are generally composed of 2 sides and a hypotenuse. The hypotenuse is usually between these 2 sides. The best possible explanation is that the right angle is included between the legs. Using the "L" shape in the "LL" theorem, it is side then right angle then side to prove congruence between triangles.

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