360/number of sides = exterior angle
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If each exterior angle is 9 degrees then it is a regular 40 sided polygon.
Each exterior angle measures 15 degrees
Each exterior angle is 72 degrees
A regular 6-sided polygon has exterior angles of 60o(360o/6)If it is not regular, and one interiorangleis 140o, then the exterior angle at that vertex is 40o (180-40).
Exterior angle of ANY regular n-sided polygon is 360/n degrees...