At a picnic, there is a contest in which hoses are used to shoot water at a beach ball from three directions. as a resultant, three forces act on the ball, F1, F2, and F3. The magnitudes of F1 and F2 are F1=45.0 newtons and F2=80 newtons. Using a scale drawing and the graphical technique, determine (a) the magnitude of F3 and (b) the angle theta such that the reultant force acting on the ball is zero.