The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 254
TIONS AND FORMULA. PLANE TRIGONOMETRY. 1. The complement of an angle or arc is the remainder ob-tained by subtracting the angle or arc from 90°. 2. The supplement of an angle or arc is the remainder ob-tained by subtracting the angle or arc from 180°. 3. The reciprocal of a quantity is the quotient… … AB~ ~ AB ~ AB BC BC BC AC ~ AC ~1KCT AB AB AB AC ~ AC ~~ AC Fig. 79, The ratios of the sides to each other are there-fore the same in all right triangles having thesame acute angle: so that, if these ratios are known in any oneof these triangles, they will be known in all of them. Theseratios,…
Astronomy
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