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Vecten points : ウィキペディア英語版
Vecten points

==Outer Vecten point==

Let ABC be any given plane triangle. On the sides BC, CA, AB of the triangle, construct outwardly drawn three squares with centres O_a,O_b,O_c respectively. Then the lines AO_a, BO_b and CO_c are concurrent. The point of concurrence outer is Vecten point of the triangle ABC.
In Clark Kimberling's Encyclopedia of Triangle Centers, the outer Vecten point is denoted by X(485). The Vecten points are named after an early 19th-century French mathematician named Vecten, who taught mathematics with Gergonne in Nîmes and published a study of the figure of three squares on the sides of a triangle in 1817.〔.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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