Find the angle between the forces given the magnitude of their resultant

find the angle between the forces given the magnitude of their resultant.
(Hint: Write force 1 as a vector in the direction of the positive x-axis and force 2 as a vector at an angle θ with the positive x-axis.) Force

  1. 45 pounds Force
  2. 60 pounds
    Resultant Force. 90 pounds