One rotation exactly. It may appear to be the same as zero degrees but sometimes the difference does matter.
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The sum of the exterior angles of a regular polygon = 360° If an exterior angle measures 8° then the number of sides = 360/8 = 45
If each angle measures 90 degrees the polygon is a square and so its angles sum to 360 degrees.
the angle measures of a quadrilateral must equal 360 degrees so you add 80+140+55=275 then subtract from 360. the answer is 85
The sum of the exterior angles of a regular polygon equal 360° . If one such angle measures 36° then the polygon has 360/36 = 10 sides.
Each interior angle measures: 152o 18' 27.69''