A bisected 90 degree angle
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An acute angle
A 45 degree angle is formed when a diagonal across a square joins one of the corners.
90 - 45 = 45 So another 45 degree angle is the complement of a 45 degree angle.
the coterminal side of 45 degree is -315 degree
You find the center of a screwed 45 degree elbow by bisecting the angle.