Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 109
circle aregular hexagon, and draw CD perpen-dicular to one of its sides. Then,the area of the polygon will be equal to half the product oi3D multiplied by the perimeter (Th. xxvi). Let us now suppose the number of sides of the polygon tooe increased, until the perimeter shall coincide with the… … BOOK IV. 109 Pr o d1e m s PROBLEMS RELATIXG TO THE FOURTH BOOK.
Geometry · Plane 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-308-201.webp)