4 in. 4 in. 12 in.- 2 in. B C 8 in. 6 in.- -6in-1" 60 lb 4. Determine the angle theta in problem 3 which will make the moment about point D the maximum. Then determine the maximum moment value. 5. Use the angle theta in problem 3 as 135. Now determine the horizontal force Ax which is applied at support A which would make the total moment of both A, and the 60 lb force at F, about point B, equal to zero.