It is given by the formula (number of sides - 2) * 180 degrees.
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With a regular polygon: 360/exterior angle = number of sides
If it is a regular polygon then it will have 10 sides
An internal angle of the polygon.
The polygon would have 10 sides.
An exterior angle of a polygon is the supplement of the corresponding interior angle. The exterior angle is the angle between an extended sides of the polygon and the next side of the polygon.