Finding member forces in a truss with marked members

[hobbyenthusia]

Homework Statement

Here is a link to a picture of the problem
http://img571.imageshack.us/img571/374/truss.jpg"
I have to find the forces in the members marked with an x.
2. The attempt at a solution
I found the support reactions, but I'm not sure if I need them. Should I try to find the lengths of the members and the angles between them next?

truss analysis*

 

[PhanthomJay]

It is always best to find the joint reactions first. Then whether you solve for the member forces by joints or sections, you yes need the angles/lengths

 

[brhmechanic]

If you are still having trouble, try to solve node G using these:
G[y]=0= -20 + EG[y]
and
G[x]=0= -20 + FG + EG[x].
Then it should be easy enough to start working your way down.