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I'm to work out the internal forces in a truss, but I can't get my head around the geometry of the truss itself. I'm starting to think there may have been information on the diagram which I missed. Could I get some directions on how to find x?

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I suspect that you are meant to assume the truss is symmetric, and which point I think you have enough data. –  dmckee Oct 20 '12 at 19:27
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I was able to reconstruct the geometry with GeoGebra. Look for equidistant triangles.

Screenshot

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