genius_noob's blog

By genius_noob, history, 6 years ago, In English

Can we always form a cyclic quadrilateral using 4 side lengths? I was solving this problem on SPOJ In order to find the maximum area of quadrilateral with side lengths given, I applied Brahmagupta's formula K={\sqrt {(s-a)(s-b)(s-c)(s-d)}}\, and i got AC. I am wondering, is that always possible? Is there any proof?

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