A system of geometry and trigonometry : with a treatise on surveying ... in which, also, the principles of rectangular surveying ... are fully explained: with a complete series of mathematical tables, and the necessary explanations (1830)
Flint, Abel, 1765-1825, Gillet, George, Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Hartford : Cooke & co. · leaf 14
one end of an arc to the other, and is themeasure of the arc ; as HG is the chord ofthe arc HIG. Fis. 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 off bya chord; thus the… … 20. The sine of an arc is a line drawn Fig, 7.from one end of the arc, perpendicular tothe radius or diameter drawn through theother end : or, it is half the chord of doublethe arc ; thus HL is the sine of the arcHB. Fig. 7. 21. The sines on the same diameter in-crease in length till they come to…
Surveying
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