90.
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A 45 degree elbow will not make a right angle, but two will, if connected in line so that they continue the turn in the same direction. (45o + 45o = 90o, a right angle.)
Each exterior angle is 45 degrees (interior angle = 135 degrees).
Hint: 90/2=...
59 degree
a right ANGLE (not angel) is ninety degrees or straight up as seen from the horizontal, example, a street corner on a map, oriented properly. four right angle make up a square.