Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 146
it is plain, that the square willenable us to inscribe, successiveh^, regular polygons of 8,16, 32, ko,., sides. And in like manner, by means of thehexagon, regular polygons of 12, 24, 48, <Scc., sides may beinscribed; and by means of the decagon, polygons of 20,40, 80, <S:c., sides. Cor. 3.… … A regular inscribed iiohjrjon heing given, to circumscribe a sirri-liar i^^^ggon about the same circle. Let 0 be the centre of the circle, and CDEFABregular inscribed polygon. At T, the middlepoint of the arc AB^draw a tangent GH^and do the same at themiddle point of each ofthe arcs BC^ CD^…
Geometry · Trigonometry
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