Because the person who created the unit defined a revolution as 360 degrees.
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360 degrees
Half of a revolution of a circle is 180 degrees and its angles added together are supplementary.
An angle that is one complete revolution is called a full angle or a complete angle. It measures 360 degrees or 2π radians.
When the original line makes a complete revolution, the formed angle is called a perigon, or round angle.
180 degrees is halfway through the circle. 360 degrees is one time around the circle. So 360° is the answer.