Which of these statements is correct? |. The sum of the interior angle measures of a regular convex polygon is found using the formula (n - 2)180, where n is the number of sides in the regular polygon. Dividing this by the number of sides (n) gives the measure of each interior angle. Il. The sum of the exterior angles of any polygon is 360. Ill. To determine the measure of each exterior angle for a regular polygon, we can divide 360 by the number of sides (n). ) lonly ) Nonly 3 I and 1 only ) LI, and 1