Construction of Escribed Circles With Ex-centres

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Illustration of the construction used to escribe circles with centres (centers) called ex-centres of the triangles. The intersections of the bisectors of the exterior angles of a triangle are the centers of three circles, each of which will touch one side of the triangle, and the two other circles.


G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 124


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