A system of geometry and trigonometry : with a treatise on surveying (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & Co. · leaf 16
of an arc is that part of the diameteror radius which is between the sine and the circumference ;thus LB is the versed sine of the arc HB. Fig. 7. 23. The tangent of an arc is a right line touching thecircumference, and drawn perpendicular to the diameter ; andis terminated by a line drawn from the… … 24. The secant of an arc is a line drawn from the centre 12 GEOMETRY. through one end of the arc till it meets the tangent; thusCK is the secant of the arc BH. Fig. 7. 25. The complement of an arc is what the arc wants of 90degrees, or a quadrant: thus HD is the complement of thearc BH. Fig. 7. 26.…
Surveying · Geometry · Trigonometry
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-318-210.webp)
