Bisected Vertical Angle of an Isosceles Triangle Small 292×320 Medium 584×640 Large 934×1024 Download Tiff Original 2189×2400 | (239.5 KB) Description Illustration to show that the bisector of the vertical angle of an isosceles triangle bisects the base, and is perpendicular to the base. Keywords angle, angles, bisect, bisector, bisects, isosceles triangle, perpendicular, triangles, vertical Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 68