180 degrees because a full rotation is 360 degrees, if you take half of 360 you get 180 :)
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180 degrees
360 degrees would be one full rotation. 180 degrees would be a half rotation. 360+180=540 So it would be a rotation and a half.
90
90 degrees
well, there are 360 degrees in a circle, so if you were to take half of it, the degrees in a semicircle, half of a circle, would be 180 degrees. So the answer is 180 degrees.