360 divided by 4 = 90
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90
A full revolution have 360 deg. For 4 revolution = 4 * 360. But degrees termed as in between to 360 deg.
2.25 is 9/4 (9/4)/360 = 9/4 * 1/360 = 9/1440 = 1/160 is the reduced term
It is: 90/360 = 1/4 of a turn of 360 degrees
((4 x 360) - 360) = 3 x 360 = 1080o so if it's regular, eg a rectangle, each angle is 270o