旁心四边形(英语:Ex-tangential quadrilateral 或 exscriptible quadrilateral)是指四条边向外延伸英语Extended side后能与一个圆心在四边形外的圆相切的四边形[1][2]

  旁心四边形 ABCD
  ABCD的四条边延长线英语Extended side
  ABCD旁切圆

参考文献

编辑
  1. ^ Radic, Mirko; Kaliman, Zoran and Kadum, Vladimir, "A condition that a tangential quadrilateral is also a chordal one", Mathematical Communications, 12 (2007) pp. 33–52.
  2. ^ Bogomolny, Alexander. "Inscriptible and Exscriptible Quadrilaterals", Interactive Mathematics Miscellany and Puzzles. [2011-08-18]. (原始内容存档于2011-09-06).