For the frame structure below, $($a$)$ determine the reactions at pin supports $C$ and $E.$ Joints at points $A,B,C,D$ and $E$ are all pin connections. $($Hint$,$ notice how point $B$ is like a joint in simple truss structure.$)(15$ points$)($b$)$ Then, determine the internal loadings acting on the cross section at point $G(5$ points$).$