Obtuse Angle Small 320×205 Medium 640×410 Large 1024×655 Download Tiff Original 2400×1536 | (137.3 KB) Description Obtuse angle Keywords angles, obtuse angle Galleries Obtuse Angles Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 111 Courtesy the private collection of Roy Winkelman
