Gothic Arch Small 320×276 Medium 640×553 Large 1024×884 Download Tiff Original 2400×2072 | (196.0 KB) Description Illustration of gothic arch about equilateral triangle. Keywords equilateral triangle, gothic arch, side 6 Galleries General Geometric Illustrations Source: Claude Irwin Palmer Library of Practical Electricity: Practical Mathematics For Home Study (New York: McGraw-Hill Book Company, Inc., 1919) 164
