In the example for Figure, where a 1000-lb downward force is applied at node 1, the external reactions V2 and V3 were calculated. But if the lengths of the truss members had been given, we could have calculated V2 and V3 by utilizing the fact that V2 + V3 must equal 1000 and by summing moments around node 2. However, because we do know V2 and V3, we can work back-ward to solve for the lengths of the truss members. Note that because there are three unknown lengths and only two equations, we can solve for only the relationship between lengths. Solve for this relationship.