Olry Terquem (1782 - 1862) was a Frenchmathematician, best known for his work in geometry, where he proved the Feuerbach's theorem about the nine-point circle of a triangle. As one of the editors of the Nouvelles Annales he published in 1842 the second analytical proof of the Feuerbach's theorem that the nine-point circle touches the incircle and the excircles of a triangle. 1782 was a common year starting on Tuesday (see link for calendar). ... 1862 was a common year starting on Wednesday (see link for calendar). ... A mathematician is a person whose area of study and research is mathematics. ... Geometry (Greek γεωμετÏία; geo = earth, metria = measure) arose as the field of knowledge dealing with spatial relationships. ... In geometry, the nine point circle is a circle that can be constructed for any given triangle. ... For alternate meanings, such as the musical instrument, see triangle (disambiguation). ... 1842 was a common year starting on Saturday (see link for calendar). ... In geometry, the incircle or inscribed circle of a triangle is the largest circle contained in the triangle; it touches (is tangent to) the three sides. ... In geometry, the incircle or inscribed circle of a triangle is the largest circle contained in the triangle; it touches (is tangent to) the three sides. ...
Terquem was among the first who recognized how great Galois' work is. Evariste Galois - Wikipedia /**/ @import /skins-1. ...
It is named so because it passes through nine significant points, with six of them lying on the triangle itself: the midpoints of the three sides, the feet of the altitudess, and the midpoints of the portion of altitude between the vertices and the orthocenter.
Soon after Feuerbach, mathematicianOlryTerquem also proved what Feuerbach did and added the three points that are the midpoints of the altitude between the vertices and the orthocenter.
Terquem was the first to use the name nine point circle (as he was the first to associate nine special points with the circle).
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