Angle Bisector Drawn Parallel to A Side Small 320×212 Medium 640×425 Large 1024×680 Download Tiff Original 3000×1991 | (105.4 KB) Description Illustration to show that if through any point in the bisector of an angle a line is drawn parallel to either of the sides of the angle, the triangle thus formed is isosceles. Keywords angle, angles, base, bisect, bisector, bisects, isosceles triangle, Parallel, side, Sides, triangles, Vertex Galleries Miscellaneous Angles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 69 Courtesy the private collection of Roy Winkelman