-^IlilllllllllllliiP^ ^A 10. A sphere is a solid described by the revolution of semi-circles about its diameter,which remains fixed. … Obs. 1.—The centre of the sphei-e is such a point (c)within the solid as is everywhere equally distant from theconvex surface of it. Obs. 2.—A diameter of a sphere is a straight line (a b)which passes through the centre, and is terminated bothways by the convex surface. This line is also called the…
Design · Decoration and ornament · Art
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