Which statement regarding the interior and exterior angles of a triangle is true? an exterior angle is supplementary to the adjacent interior angle. an adjacent interior angle is supplementary to a remote interior angle. a remote interior angle is congruent to the exterior angle. an exterior angle is supplementary to the remote interior angle.

The correct answer is:

An exterior angle is supplementary to the adjacent interior angle.

Explanation:

An exterior angle of a triangle and its adjacent interior angle form a linear pair. This means they form a straight line, and a straight line has a measure of 180°. Since they combine for a total of 180°, this means they are supplementary.

the first option is the answer.