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  1. The tangential quadrilateral formed by centers of 4 tangent circles | plane geometry | intermediate

    The tangential quadrilateral formed by centers of 4 tangent circles | plane geometry | intermediate

    9
  2. Tangential quadrilaterals, the sums of opposite sides, Pitot's theorem | plane geometry | elementary

    Tangential quadrilaterals, the sums of opposite sides, Pitot's theorem | plane geometry | elementary

    35