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1. The problem statement, all variables and given/known data

What I'm trying to figure out is a reaction of a solid desk (don't know if this is the proper term) given this picture:

http://twoflower.matfyz.cz/inc/eng.gif [Broken]

I need to compute the reactions A, B and C (they corresponding to points denoted by 'a', 'b' and 'c' on the picture.) The dimensions 'a', 'b' and 'c' are constants and I know them.

3. The attempt at a solution

So far I computed the reaction C from this equation:

[itex]

\cos 60 * F_3 + C*\sin 30 = 0

[/itex]

But I cannot figure out, how to compute the reaction B and A, I can't put the right equations together...

Could someone please point me to the right direction?

Thank you in advance,

best regards.

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# Reaction of a solid desk

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