Triangle Divided by Parallel Lines to Form Proportionate Triangles
Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to the third side.
Keywordstriangle, side, parallel lines, proportion, Sides, proportions, divide proportionally, proportionate
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 144