o dummy 8 m horizontally. He does 150 J of mechanical work. What is the magnitude of the force? 9. Determine the interior angles of AABC for A(5, 1), B(4, -7), and C(-1, -8). 10. Consider the parallelogram with vertices (0, 0), (3, 0), (5, 3), and (2, 3). Find the angles at which the diagonals of the parallelogram intersect. 11. The points P(-2, 1), Q(-6, 4), and R(4, 3) are three vertices of parallelogram PQRS. a) Find the coordinates of S. b) Find the measures of the interior angles of