Ok, I have a problem similar to a slider crank but not quite.(adsbygoogle = window.adsbygoogle || []).push({});

http://imageshack.us/photo/my-images/851/sw1b.png/

Fixed points are A and B, all others are free to pivot. The beam labeled 20 is rotating around, at this snapshot 40 degrees from vertical. How can I find how many degrees back and forth the beam that is fixed at A turns in response? I'd quite like to find a general solution

I really can't figure out the geometry for this one

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# Mechanism Geometry

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