The exterior angle of a polygon at a vertex is supplementary to its interior angle. Which statement is correct?

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Multiple Choice

The exterior angle of a polygon at a vertex is supplementary to its interior angle. Which statement is correct?

Interior and exterior angles at a vertex sit on a straight line. When you extend a side and look at the angle formed with the adjacent side, that exterior angle lies on the outside of the polygon while the interior angle sits inside on the same straight line. Because they form a linear pair along that line, their measures add up to 180 degrees. This holds for any polygon, so the exterior angle is always supplementary to the interior angle.

Interior and exterior angles at a vertex sit on a straight line. When you extend a side and look at the angle formed with the adjacent side, that exterior angle lies on the outside of the polygon while the interior angle sits inside on the same straight line. Because they form a linear pair along that line, their measures add up to 180 degrees. This holds for any polygon, so the exterior angle is always supplementary to the interior angle.

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