it doesnt
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As an example: a square has four right-angles, one in each corner, and they prove that a right angle doesn't always open to the right.
The initial assumption is "that it is NOT a right angle"
A right angle. Ninety degrees. Put more simply, but that answer is the correct one, look at a square, a real square, and then at the corner...that is a right angle, ninety degrees, square angle.
square
To prove that two right triangles are similar, all you need to show is that one of them has one acute angle that's equal to one acute angle of the other one.