Which of the following statements about the relationship between an interior angle of a polygon and its adjacent exterior angle are true? Choose all that apply.

A. They form a linear pair.

B. They are supplementary.

C. They are complementary.

D. They are alternate exterior angles.

The sum of the interior angle measures of a triangle

is 180°. You can find the sum of the interior angle

measures of any n-gon, where n represents the

number of sides of the polygon, by multiplying

(n - 2) 180°. In a polygon, an exterior angle forms a

linear pair with its adjacent interior angle, so the

sum of their measures is 180°. In a triangle, the

measure of an exterior angle is equal to the sum of

the measures of its two remote interior angles.