As in the figure, are tangency to both and with the point of tangency to them and are on . Show that is the incentre of
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I can prove that if then we are done. But how to show that these two angles are actually equal?
Last edited by elim; Jan 18th 2011 at 11:56 PM.
Last edited by elim; Jan 22nd 2011 at 08:53 AM.
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