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 17
ainedby dividing ADX by AC0, which quotient becomes AT>V Whenthe arc terminates in the first and third quadrants, the tangentsare counted on the line D^ from C0 upwards, and are consid-ered as positive. But in the second and fourth quadrants, thetangents are counted from C0 downwards, and are… … §.] 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…
Plane trigonometry · Surveying
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