Right Angle Small 320×214 Medium 640×428 Large 1024×685 Download Tiff Original 2400×1605 | (182.5 KB) Description Right angle with square at perpendicular lines Keywords angles, perpendicular lines, right angle, square Galleries Right Angles Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 111
