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Shufeng Tan

  • GoGeometry p1298

    Activity

    Shufeng Tan

  • gogeometry.com P990

    Activity

    Shufeng Tan

  • gogeometry.com P1166

    Activity

    Shufeng Tan

  • gogeometry.com P1168

    Activity

    Shufeng Tan

  • gogeometry.com P1150

    Activity

    Shufeng Tan

  • Triangle incenter and orthocenter

    Activity

    Shufeng Tan

  • Nine-point circle

    Activity

    Shufeng Tan

  • Euler Line

    Activity

    Shufeng Tan

  • gogeometry.com Problem 1153

    Activity

    Shufeng Tan

  • gogeometry.com p1167

    Activity

    Shufeng Tan

  • gogeometry.com p1167

    Activity

    Shufeng Tan