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There are: 1/4 or a quarter of a turn is equal to 90 degrees
A circle comprises 360 degrees. So, a fourth of a circle is 360/4 = 90 degrees.
It is 90 degrees of the circle's circumference which has a full turn of 360 degrees.
Quarter turn is 90 degrees. Half a turn is 180 degrees. Three-quarter turn is 270 degrees. Full turn is 360 degrees.
360 degrees