Thread: geometry help
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Old May 19th, 2008, 05:19 PM
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Quote:
Originally Posted by Zyger View Post
All I need now is the one with the pentagon
A general desire for the underyling is never hurtful

usign my formula \frac{5}{4}\cdot{b^2}\cdot\cot\bigg(\frac{\pi}{5}\bigg)=\frac{10(\sqrt{5}+1)\sqrt{2}x^2}{\sqrt{5-\sqrt{5}}}\approx{27.52b^2}

So now apply it

plug in your b value

and use the fact that

A=\frac{1}{2}p\cdot{a}

to find the apothem
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