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
GEOMETRY. 11 16. A chord is a right line drawn fromone end of an arc to the other, and is themeasure of the arc ; as HG is the chord ofthe arc HIG. Fig. 6. … Note. The chord of an arc of 60 degrees is equal in lengthto the radius of the circle of which the arc is a part. 17. The segment of a circle is a part of a circle cut oft* bya chord ; thus the space comprehended between the arc HIGand the chord HG is called a segment. Fig. 6. 19. A sector of a…
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-64-40.webp)
