Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments Small 320×149 Medium 640×298 Large 1024×477 Download Tiff Original 2400×1117 | (117.1 KB) Description Illustration to show that an angle bisector of a triangle divides the opposite side into segments which are proportional to the adjacent sides. Keywords angle bisector, divide proportionally, proportion, proportionate, proportions, side, Sides, triangle Galleries Proportions Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 146