4 b e B 0F2 a C E D 5 -F2 3 -F1 4 G 5 3 F1 4 C A XTwo couple forces F1 = 70N, F2 = 65N, act on the frame and given that d = 4m and 6 = 31. The other length parameters are a = 4m, b = 8m, c = 12m, and e = 12m. Compute the moment by the following methods: F1/4I U A x a) Find the moment of each couple by using cross product and add them up. 1s} 1v - m b) Sum up the moments of all forces component about point B, resolve forces into x and y components