Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 18
§.] TRIGONOMETRY. consist of the produced part of the radius, while those repre-sented by the full lines consist of the radius together with theproduced part; the latter are considered as positive and the for-mer as negative. Hence in the first and fourth quadrants thesecants are positive, and in… … Third quadrant.
Plane trigonometry · Surveying
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