Presumably it states that for any triangle its 3 interior angles add up to 180 degrees.
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If you are referring to Pythagoras' theorem for right angle triangles then the theorem states that for any right angle triangle the square of its hypotenuse is equal to the sum of its squared sides.
exterior angle theorem
No but the sum of the squared sides will equal the square of the hypotenuse using Pythagoras' theorem for a right angle triangle
For any polygon: 180-interior angle = exterior angle and the exterior angles of any polygon add up to 360 degrees
You see how many triangles fit into the shape and multiply by 180 degrees