A system of geometry and trigonometry : with a treatise on surveying ... in which, also, the principles of rectangular surveying ... are fully explained: with a complete series of mathematical tables, and the necessary explanations (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & co. · leaf 110
E 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, ADDTHE 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
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