A system of geometry and trigonometry : with a treatise on surveying (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & Co. · leaf 112
FIRST LETTERS ARE ALIKE, AND THE LAST UNLIKE, SUBTRACTTHE SUM OF THE COURSES FROM 180°. III. If the first letters are unlike, and the LAST alike, add THE COURSES. IV. If the first letters are unlike, and THE LAST ALSO, SUB-TRACT THE LESS COURSE FROM THE GREATER. In employing these rules, the…
Surveying · Geometry · Trigonometry
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