Page:Euclid's Elements 1714 Barrow translation.djvu/513

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Concerning the Sphere and Cylinder, Invetigated by the Method of Indiviibles, and briefly Demontrated by the Reverend and Learned Dr. Iaac Barrow. HE main Deign of Archimedes in his Treatie of the Sphere and Cylinder, is to reolve thee four Problems. 1. ''To find the proportion of the uperficies of a phere to any determinate circle; or to find a circle equal to the uperficies of a given phere. ''

2. To find the proportion of the uperficies of any egment of a phere to any determined circle; or to find a circle equal to the uperficies of any aign'd egment.