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.
