What size is a exterior angle?

The exterior angle of a polygon is formed by one side of the polygon and the extension of an adjacent side. For any polygon, the measure of an exterior angle can be calculated by subtracting the interior angle from 180 degrees. Additionally, the sum of all exterior angles of a polygon, regardless of the number of sides, is always 360 degrees. Therefore, each exterior angle can vary in size depending on the specific polygon's shape and number of sides.