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 resultant of the applied forces when en α =45° and the point of intersection of the line of action of that resultant with a line drawn through points A and B,
(b) The value of α so that the line of action of the resultant passes through fold EF.