Triangular City Block With Angles and Lengths Small 320×209 Medium 640×418 Large 1024×669 Download Tiff Original 2400×1567 | (218.3 KB) Description Illustration showing an angle of 23 degrees 40 minutes making a triangle in a city block and marking off streets at 100 foot intervals. Keywords 100 foot, 23 degrees 40 minutes, angle, angles, city block, Degree, feet, intervals, line, lines, streets, triangle, triangles, trigonometry Galleries Trigonometry: Triangles Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 431 Courtesy the private collection of Roy Winkelman
