As four holes are punched simultaneously in a piece of aluminum sheet metal, the punches exert on

Question:

As four holes are punched simultaneously in a piece of aluminum sheet metal, the punches exert on the piece the forces shown. Knowing that the forces are perpendicular to the surfaces of the piece, determine
(a) The value of α so that the resultant of the applied forces is parallel to the 2.1-kip force,
(b) The corresponding resultant of the applied forces and the point of intersection of its line of action with a line drawn through points A and B.