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Spieker center

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  • Boutte Gilles
    Dear all Hyacinthists, Let ABC be a triangle and A B C the triangle whose sides are the common tangents between the ninepointcircle and the excircles of ABC.
    Message 1 of 1 , Mar 3, 2002
      Dear all Hyacinthists,

      Let ABC be a triangle and A'B'C' the triangle whose sides are the common
      tangents between the ninepointcircle and the excircles of ABC.
      Thus A'B'C' and the medial triangle of ABC are perspective, perspector
      is the Spieker center X_10 of ABC.

      Can you give references on this fact ?

      Best regards,

      Gilles
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