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Math Help - Vector problem

  1. #1
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    Vector problem

    I tryed to solve an apearently simple geometry problem but i could not. Someone please help me!(excuse my english)
    In the interior of an equilateral triangle (whose center is O) we consider a point P and let P1, P2, P3 be the orthogonal projection of the point P on the three sides of the triangle. prove that \vec{PP_1}+\vec{PP_2}+\vec{PP_3}=\frac{3}{2}\vec{P  O}
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  2. #2
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    Re: Vector problem

    Google: Viviani's Theorem
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