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 - Page 168by Adrien Marie Legendre - 1837 - 359 pagesFull view
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Arthur Schultze, Frank Louis Sevenoak - Geometry - 1913 - 457 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...