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 216
in the series 10, 100, 1000, 8ce.The use and construction of these tables are about to be explained. VIII. The diiferenee between any angle and a riglit angle, or between anyarch and a quadrant, is calledthe Complement of that angle, orof that arch. Thus, if BH beperpendicular to AB, the angleCBH… … 2i§ PLANE TRIGONOMETRY. IX. The sine, tangent, or secant of the complement of any angle is calledthe Cosine, Cotangent^ or Cosecant of that angle. Thus, le< CL orDB, which is equal to CL,be the sine of the ans;le CBH; HKthetangent, and BR the secant of the same angle; CL or BD is the co-sine, HK…
Euclid's Elements · Geometry · Trigonometry
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-177-18.webp)
