Find the unknown side of a Cyclic quadrilateral when d is the diameter or the circle

1. The problem statement, all variables and given/known data
Given a cyclic quadrilateral with side lengths 1, 2, 3 and d (in that order) where d is the diameter of the circle, find d.


3. The attempt at a solution

I tried using Ptolemy's theorem and Brahmagupta's formula, but to no avail. Can I get pointed in the correct direction please?
 
Re: Find the unknown side of a Cyclic quadrilateral when d is the diameter or the cir

Maybe you can find something useful http://pballew.blogspot.com/2009/10/notes-on-cyclic-quadrilaterals.html" [Broken].
 
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