Convex Polyhedral Angle Small 320×299 Medium 640×599 Large 1024×958 Download Tiff Original 2400×2246 | (256.4 KB) Description Illustration of a convex polyhedral angle. "The sum of the face angles of any convex polyhedral angle is less than four right angles." Keywords angles, convex, lines, plane, planes, polyhedral angle Galleries Polyhedral Angles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 285