$(10$ points total$)$ Consider the $2-$D truss structure shown below. The support reaction at $"A"$ is $A_y=8,400lbs($up$)$ and the support reactions at $"K"$ are $K_x=0$ lbs and $K_y=3,600lbs($up$).$ Using the methods of Sections, determine the

forces in members DF$,$ DE$,$

and CE$.$ State whether each member is in tension or compression.