Elements of geometry : containing the first six books of Euclid, with a supplement on the quadrature of the circle, and the geometry of solids : to which are added, Elements of plane and spherical geometry (1826)
Playfair, John, 1748-1819, Euclid · Philadelphia : Marot & Walter · leaf 254
gle BCD, sin. BC : R :: sin. CD : sin. B, (19.); and in the triangleADC, sin. AC : R: sin. CD: sin. A; wherefore, by equality inversely,sin. BC : sin. AC :: sin. A : sin. B. In the same manner, it may beproved that sio. BC : ein. AB :: sin. A : sin. C, &c. Therefore, &c.Q. E. D. Kk 23*…
Euclid's Elements · Geometry · Trigonometry
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