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Method to calculate the area of a cyclic n-gon


The area of a cyclic quadriateral, given the side lengths, is given as follows: $$ \sqrt{(s-a)(s-b)(s-c)(s-d)} $$

(Brahmagupta's formula)

Where $ s = \frac{a+b+c+d}{2}. $

I want to find a similar expression, or a way of formulating an expression for a cyclic $n-gon$ given it's sides, since I want to implement it in a program.

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