The Pythagorean theorem is actually the law of cos, where the angle is 90.
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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.
With right angle triangles
A right angle triangle.
Right angle triangles
When working out the sides of a right angle triangle.