Isosceles Triangle With Parallelogram inside
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Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs are drawn, a parallelogram is formed whose perimeter is constant, being equal to the sum of the legs of the triangle.
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Miscellaneous TrianglesSource
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 71
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