It is also called Wallace's line. When a perpendicular line is drawn from any point O on the circumference of the circumscribing circle of triangle ABC to the three sides AB, BC, and CA of the triangle, or to their extensions, the feet D, E, and F of the perpendicular line are in a straight line. This straight line DE is called Simson's line. This theorem about triangles is said to have been discovered by British mathematician R. Simson (1687-1768). However, since this theorem is also stated in papers by W. Wallace (1999, 1800), it is also called Wallace's theorem. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ウォーレス線ともいう。三角形 ABCの外接円の周上にある任意の1点Oから,その三角形の3辺 AB,BC,CAあるいはその延長上へ垂線をおろすとき,その足D,E,Fは一直線上にある。この直線 DEをシムソン線という。三角形に関するこの定理は,イギリスの数学者 R.シムソン (1687~1768) によって発見されたといわれる。しかしこの定理は W.ウォーレスの論文 (99,1800) のなかにも述べられているので,ウォーレスの定理ともいわれる。
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