360 degrees.
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A semi-circle, half a circle, by definition is 180 degrees, half of a rotation. A whole circle has a whole rotation, which is 360 degrees.
It was the ancient Babylonians and Greeks who classified angles into degrees out of 360 degrees which is full rotation of circle.
The centre of rotation, the angle of rotation and, unless the angle is 180 degrees, the direction of rotation.
Measure the angle in a plane perpendicular to the axis of rotation, between the position of a fixed point at the start and end of the rotation.
Central Angle