Tamara is writing statements to prove that the sum of the measures of interior angles of triangle pqr is equal to 180°. line m is parallel to line n. line n is parallel to line m. triangle pqr has vertex p on line n and vertices q and r on line m. angle qpr is 135 degrees. segment pq makes 30 degrees angle with line n and segment pr makes 15 degrees angle with line n. which is a true statement she could write? angle prq measures 30°. angle prq measures 15°. angle pqr measures 15°. angle pqr measures 45°.