That depends on how many sides the polygon has but in general the number of degrees inside a polygon are: (n-2)*180 = sum of degrees whereas 'n' is the number of sides of the polygon.
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If each exterior angle is 30 degrees the polygon has 360/30 = 12 sides.
It will have 6 sides
18 sides
360/36 ie 10
A regular polygon cannot have internal angles smaller than 60 degrees. If each EXTERNAL angle is 40 degrees, the triangle has 360/40 = 9 sides.