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Thread: Triangle: Very hard problem

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    Jan 2002
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    Triangle: Very hard problem





    If abc is triangle, the angles 1,2 and 3 are equal and the angles 4,5 and 6 are equal and the angles 7,8 and 9 are equal

    prove that:
    the triangle xyz is equilateral triangle
    Last edited by prokhaled; Feb 7th, 2002 at 11:45 AM.

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