Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 141
equal to half the sum of the perimeters of theupper and lower bases, multiplied by the slant height. THEOREM VIII. The convex surface of a cone is equal to half the product of th<>circumference of the base multiplied by the slant height. In the circle which forms the baseof the cone, inscribe… … BOOK VI. 14) Of the Cone. of the perimeter of the base by theslant height (Th. vi). Let us now suppose the numberof sides of the polygon to be indefi-nitely increased: the polygon willthen coincide with the base of thecone, the pyramid will become thecone, and the line Sf which meas-ures the slant…
Geometry · Plane trigonometry
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-100-222.webp)
