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# Side of regular polygon from polygon area

##### Calculates the side length of regular polygon given the area of the regular polygon and number of sides
Timur2014-06-15 08:10:09

We need to find side length of regular polygon given its area and number of sides.
As it was written in Regular polygon area from circumcircle, the dependence of polygon area from circumradius is
$S=n\frac{1}{2}r^2sin(\frac{360}{n})$.
$r=\sqrt{ \frac{2S}{n sin(\frac{360}{n})} }$.
And half of side is the opposite leg of the triangle of radius and altitude to this side from the center
$l=2r sin(\frac{360}{2n})} }$

##### Side of regular polygon from polygon area

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