For the structure shown, members $AD$, $DC$, and ABC are assumed to be solid rigid members; member $ED$ is a cable. For this structure, determine the reaction at $A$, the tension on cable $ED$, and the force in member $DC$.

For the structure shown, members $AD$, $DC$, and ABC are assumed to be solid rigid members; member $ED$ is a cable. For this structure, determine the reaction at $A$, the tension on cable $ED$, and the force in member $DC$.