Notes
- ^ Sphaira, Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus
- ^ a b Pages 141, 149. E.J. Borowski, J.M. Borwein. Collins Dictionary of Mathematics. ISBN 0-00-434347-6.
- ^ New Scientist | Technology | Roundest objects in the world created
- ^ Hilbert, David David Hilbert was a German mathematician, recognized as one of the most influential and universal mathematicians of the 19th and early 20th centuries. He discovered or developed a broad range of fundamental ideas in many areas, including invariant theory and the axiomatization of geometry. He also formulated the theory of Hilbert spaces, one of; Cohn-Vossen, Stephan (1952). Geometry and the Imagination (2nd ed.). Chelsea. ISBN 0-8284-1087-9.
<<Table of Contents A sphere is a perfectly round geometrical object in three-dimensional space, such as the shape of a round ball. Like a circle in two dimensions, a perfect sphere is completely symmetrical around its center, with all points on the surface lying the same distance r from the center point. This distance r is known as the radius of the sphere. The | Next>> | Show All>>
