Two identical rods $AB$ and $CD$ have length $L=24$ in$,$ cross sectional area $A=2i{n}^2,$ and $E=17,000$ksi. The rods support the rigid beam which is pinned at $F.$ The distance $a=12$ in$.$ If the vertical force $P=10$ kips is applied at the end of the beam, what is the angle of rotation of the beam? USE THE FORCE METHOD TO SOLVE