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http://users.on.net/~rohanlal/truss.jpg [Broken]

Can someone please explain to me how it is that member FG is a zero force member?

Isn't the only way for a member to be zero force if

1. Two non collinear members form a joint and no force is being exerted on this joint.

or 2.

When three members form a truss joint for which 1 member is joined at an angle with two collinear members and no force is exerted on this joint.

Member FG does not satisfy either of these.

Can someone please explain to me how it is that member FG is a zero force member?

Isn't the only way for a member to be zero force if

1. Two non collinear members form a joint and no force is being exerted on this joint.

or 2.

When three members form a truss joint for which 1 member is joined at an angle with two collinear members and no force is exerted on this joint.

Member FG does not satisfy either of these.

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