Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 460
remarkable propertythat the surface of a sphere is two thirds of the surface of the circum-scribed cylinder (Exs. 1550 and 1551) is due again to Archimedes. Thediscoveiy of this proposition, and tlie discovery of the correspondingproposition for volumes (§ 1001), were the philosophers chief pride,… … 975. Defs. A zone is a closed tigure on the surface of asphere whose boundary is composed of the circumferencesof two circles whose planes are parallel. The circumferences forming theboundary of a zone are its bases. Thus, if semicircle NES is revolvedabout y^S as an axis, arc AB will gen-erate a…
Geometry, Plane · Geometry, Solid
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