Right Angles With Same Vertex Small 320×248 Medium 640×497 Large 1024×795 Download Tiff Original 2400×1863 | (202.6 KB) Description An illustration showing when one straight line meets another straight line and makes the adjacent angles equal, each of these angles is called a right angle. Keywords Adjacent, angles, equal, geometry, line, lines, perpendicular, plane angle, right, straight, Vertex Galleries Right Angles Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 11 Courtesy the private collection of Roy Winkelman