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I'm trying to give my user the possibilty to get a value using a mathematical relation.

I need your help in this one.

What it is the value of $A$?

$$ S = \frac{{\color{red}A}B^2}{4\tan\frac{\pi}{{\color{red}A}}} $$

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    This is a transcendental equation. Symbolic solutions are unlikely to be simple, so one usually falls back to numerical methods for these.2012-03-24
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    [It looks like Wolfram Alpha can't solve it.](http://www.wolframalpha.com/input/?i=solve+S+%3D+A+B%5E2+%2F+%284+tan+%28pi%2FA%29%29+for+A)2012-03-24

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