It is Pythagoras' theorem that states for any right angle triangle when its hypotenuse is squared it is equal to the sum of its squared sides.
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The Pythagorean theorem is actually the law of cos, where the angle is 90.
90
With right angle triangles
Yes Pythagoras' theorem is applicable to right angle triangles
Simply because the Pythagorean Theorem is not true for any triangle that doesn't have a right angle in it. If a triangle has a right angle in it, then it satisfies the Theorem. If it hasn't, then it doesn't. And if it satisfies the Theorem, then it has a right angle in it, and if it doesn't, then it hasn't.