Triangle With Bisector and Perpendicular From Vertex Drawn
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Illustration to show the bisector of the vertical angle of a triangle makes with the perpendicular from the vertex to the base an angle equal to half the difference of the base angles.
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Miscellaneous TrianglesSource
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 72
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