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Given triangle $\triangle ABC$ , with $AB=AC$ and 2 times(length of inradius) which is equal to the length of exradius of excirle opposite vertex $A$. Setup the coordinate system in the plane of triangle $\triangle ABC$ as follow: Origin at vertex $B$, positive X-axis along $BC$ and positive Y-axis on the $A$ side of $BC$. Find the equations of the incircle , excircles and circumcircle.

Also this question is related to the incenter excenter configuration of triangle.I would like to get some help to solve the above question.

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    it was not that i did not accept the answers but i was really not knowing what we should do to show that i have accepted the answer....really sorry for that2012-06-12
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    You can find the equation of incircle [here](http://mathworld.wolfram.com/Incircle.html).2012-06-12

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