Problem $3$: repeat problem $2$ for each of the trusses below

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$|$ Chapter $2$: Development of Plane Truss Equations

Problem $2$

Consider a three$-$member truss shown. Suppose that all members of the truss have identical areas of cross section $A=5{10}^{3}m{m}^2$ and Young modulus $E=200$GPa. The hinged supports at joints $A,B$ and $C$ allow free rotation of the members about the $z-$axis $($taken positive into the plane of the page$).$