Triangle With Bisectors of Vertical Angles

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Illustration to show the bisector of the vertical angle A of a triangle ABC, and the bisectors of the exterior angles at the base formed by producing the sides AB and AC, meet in a point which is equidistant from the base and the sides produced.


G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 72


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