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Sixty is Special (Posted on 2017-08-18) Difficulty: 4 of 5
I is the incenter of triangle ABC with B' the intersection of the ray BI and side AC and C' the intersection of ray CI and side AB. Prove that AB'IC' is a cyclic quadrilateral if and only if angle BAC is 60 degrees.

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  Subject Author Date
SolutionSolution & a further resultJer2017-08-27 17:58:50
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