A 1-inch square aluminum strut is held in place by a pin at point A and rollers at points B and C that prevent rotation. The strut has a length of 3 feet between points A and B (LAB=3 ft). To determine the maximum allowable load P on the strut, the largest possible lengths of LBC and LCD must be found considering buckling in the plane shown and using an aluminum modulus of 10.4E6 psi and a safety factor of 3.2.