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A right triangle has a 90 degree angle in it. This is not to be confused with a wrong triangle, which has two 90 degree angles.
A 90 degree rotation is a quarter of a turn.
90 degree but not just for a triangle it can be 90 degree square or what ever shape you talking about
I'm not sure but you can just bracket the 135 degree angle by attaching one end to the other and make a wall?
A 90 degree angle is a right angle