Bisector of an Exterior Angle of an Isosceles Triangle Small 320×307 Medium 640×615 Large 1024×984 Download Tiff Original 2498×2400 | (212.4 KB) Description Illustration to show that the bisector of an exterior angle of an isosceles triangle, formed by producing one of the legs through the vertex, is parallel o the base. Keywords angle, angles, base, bisect, bisector, bisects, exterior, isosceles triangle, triangles Galleries Miscellaneous Triangles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 69
