Leg Produced through the Vertex of an Isosceles Triangle

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Illustration to show that if one of the legs of an isosceles triangle is produced through the vertex by its own length, the line joining he end of the leg produced to the nearer end of the base is perpendicular to the base.


G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 69


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