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" The radius of a sphere is a straight line, drawn from the centre to any point of the surface ; the diameter, or axis, is a line passing through this centre, and terminated on both sides by the surface. "
Elements of Geometry and Trigonometry: With Notes - Page 176
by Adrien Marie Legendre - 1830 - 316 pages
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Solid Geometry

Charles Austin Hobbs - Geometry, Solid - 1921 - 216 pages
...recent years the surface has been called a sphere in accordance with the usage of higher mathematics. A straight line drawn from the centre to any point of the sphere is called a radius. A straight line passing through the centre and having its extremities in...
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Schultze and Sevenoak's Plane and Solid Geometry; Revised by Arthur Schultze

Arthur Schultze, Frank Louis Sevenoak - Geometry - 1913 - 484 pages
...which are equally distant from a point. The fixed point is called the center of the sphere. 694. DBF. The radius of a sphere is a straight line drawn from the center to any point in the surface. 695. DBF. The diameter of a sphere is a straight line passing through...
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