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A.Zakharov

  • Anticenter of the cyclic quadrilateral.

    Activity

    A.Zakharov

  • new

    Activity

    A.Zakharov

  • x(6) and X(187)

    Activity

    A.Zakharov

  • 4 R сonstruction X(18) X(61)

    Activity

    A.Zakharov

  • Desargues theorem for incenters. x(1127)

    Activity

    A.Zakharov