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360 degrees
A full revolution have 360 deg. For 4 revolution = 4 * 360. But degrees termed as in between to 360 deg.
Four of them because 4*90 = 360 degrees which is a full revolution
Fractions of a revolution make sense, e.g. 360 degrees = 1 revolution 180 degrees = 1/2 revolution 137 degrees = 137/360 of a revolution 2pi radians = 1 revolution 1 radian = 1/(2pi) revolution
Because the person who created the unit defined a revolution as 360 degrees.