One fifth... 1/5
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225/360 or 45/72
72 degrees each. There are 5 angles. You divide 360 degrees by 5 and get 72 degrees.
This is a fraction 1/4
It is: 90/360 = 1/4 of a turn of 360 degrees
72 degrees 12/60 of 360 = 1/5 x 360 = 72