Sector Small 320×140 Medium 640×280 Large 1024×448 Download Tiff Original 2400×1049 | (659.5 KB) Description The sector is a hinged rule with scales used for various mathematical calculations. Keywords calculations, cube roots, Division, hinged rule, math tool, mathematical tool, mathematics, military compass, multiplication, proportion, proportional compass, Ruler, scales, sector, solving, squares, trigonometry Galleries Miscellaneous Math Tools Source: William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)
