A window$-$washing scaffold is supported by two space frames, one of which is illustrated below. The

support at A is a ball$-$and$-$socket, and those at B and C are frictionless supports; C also has a pin constraint in

the x$-$direction, to keep the frame from rotating. Joint D is centered $1$ m above the midpoint of line BC$,$

which is $1$ m long. Compute the reaction forces at A$,$ B$,$ and C$,$ and the force in each member. $3.$ A window$-$washing scaffold is supported by two space frames, one of which is illustrated below. The support at $\backslash ($ A $\backslash )$ is a ball$-$and$-$socket, and those at $\backslash ($ B $\backslash )$ and $\backslash ($ C $\backslash )$ are frictionless supports; $\backslash ($ C $\backslash )$ also has a pin constraint in the $\backslash ($ x $\backslash )-$direction, to keep the frame from rotating. Joint $\backslash ($ D $\backslash )$ is centered $1$ m above the midpoint of line $\backslash ($ B C $\backslash ),$ which is $1$ m long. Compute the reaction forces at $\backslash ($ A$,$ B $\backslash ),$ and $\backslash ($ C $\backslash ),$ and the force in each member.