Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 221
ES, COSINES,TANGENTS, &c. XV. The sine of an arc is half the chord which subtends a double arc. For the radius CA, perpen-dicular to the chord MN, bi-sect» this chord, and likewisethe arc MAN ; hence MP, thesine of the arc MA, is half thechord MN which subtendsthe arc MAN, the double ofMA. The… … 222 PLANE TRIGONOMETRY.
Trigonometry · Geometry
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