I think I know what you mean! The exterior angle of a regular n-sided polygon is always 360/n degrees. which makes no sense as written. If the interior angles are 174o the the exterior is 180 - 174 ie 6 and the number of sides is 360/6 = 60.
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It would not have sides because it would be a straight line. A straight angle is 180 degrees. Anything above that is a "Reflex"
If interior angle is 178o then the exterior angle = 180 - 178 = 2o So the number of sides = 360 / 2 = 180 sides.
If each interior angle is 60 degrees then it will have 3 sides in the form of an equilateral triangle.
18 sides
Those wouldn't be angle measurements, they would be sides. A triangle could be constructed with sides of those lengths.