Art of Problem Solving

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Does it apply to all quadrilaterals, cyclic and non-cyclic?

: Yes it does; I believe it's a special case of [[Brahmagupta's Formula]]. <font style="font-family:Georgia,sans-serif">[[User:Azjps|azjps]] ([[User talk:Azjps|<font color="green">talk</font>]])</font> 02:35, 27 January 2011 (UTC)

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