Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 40
11. Any polygon is said to be in-scribed in a circle when the vertices ofall the angles are in the circumference.The ciicle is then said to circumscribethe polygon. … 40 GEOMETRY Definitions 12 A secant is a line which meets thecircumference in two points, and liespartly within and partly without theThus A B is a secant. circle. 13. A tangent is a line which hasbut one point in common with the cir-cumference. Thus, CMB is a tangent. \
Geometry · Plane trigonometry
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![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-127-49.webp)
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