Triangle With Bisector and Perpendicular From Vertex Drawn Small 320×269 Medium 640×538 Large 1024×861 Download Tiff Original 2400×2017 | (215.4 KB) Description 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. Keywords angle bisector, angles, bisectors, perpendicular, triangle, triangles, Vertex Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 72