 | William Frothingham Bradbury - Geometry - 1880 - 260 pages
...surface, of which every point is equally distant from a point within called the centre. A sphere can be described by the revolution of a semicircle about its diameter which remains fixed. 89. The Radius of a sphere is the straight line from the centre to any point of the surface. 90. The... | |
 | Joseph Haythorne Edgar - Geometry, Descriptive - 1880 - 284 pages
...projection of a sufficient number of its generatrices. THE SPHERE. DEF. A sphere is the surface generated by the revolution of a semicircle about its diameter, which remains fixed in position during the motion. • A sphere may, therefore, be regarded as the locus of all points... | |
 | Joseph Haythorne Edgar - 1880 - 300 pages
...projection of a sufficient number of its generatrices. THE SPHERE. DEF. A sphere is the surface generated by the revolution of a semicircle about its diameter, which remains fixed in position during the motion. A sphere may, therefore, be regarded as the locus of all points in space... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 428 pages
...similar, and parallel to one another ; and the others are parallelograms. 14. A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains fixed. 15. The axis of a sphere is the fixed straight line about which the semicircle revolves. 16. The centre... | |
 | Moffatt and Paige - 1883 - 602 pages
...a point situated within the body, and called the centre. A Globe, or Sphere, may be supposed to be described by the revolution of a semicircle about its diameter, which remains unmoved. A Great Circle of a sphere is one whose plane passes through the centre of the sphere. A great... | |
 | David Allan Low - Geometry, Descriptive - 1884 - 142 pages
...is at the same distance from a point within it, called its centre. A sphere may also be defined as a solid described by the revolution of a semicircle about its diameter, which remains fixed. The centre of the semicircle is the centre of the sphere. PROBLEM 8. To draw the projections of a prism... | |
 | William John Loftie - Ocean travel - 1888 - 662 pages
...definitions in spherical geometry that will aid him in comprehending the first principles of navigation. A Sphere is a solid described by the revolution of a semi-circle about its diameter, that diameter being immovable during the motion of the semi-circle. Axis and Poles. — This diameter... | |
 | John Casey - Geometry - 1889 - 216 pages
...SECTION I. — PRELIMINARY PROPOSITIONS AND DEFINITIONS. 1. DEF. I. — A sphere is the surface generated by the revolution of a semicircle about its diameter, which remains fixed. The term sphere is used in a two-fold signification — 1°. As denoting the surface 2°. The solid... | |
 | Edward Mann Langley, W. Seys Phillips - 1890 - 538 pages
...and parallel to one another ; and the others are parallelograms. 14. A < sphere ' is a solid figure described by the revolution of a semicircle about its diameter, which remains fixed. 15. The ' axis of a sphere ' is the fixed straight line about which the semicircle revolves. 16. The... | |
 | Euclid - Geometry - 1892 - 460 pages
...faces, which are equal and equilateral triangles. SOLIDS OP REvOLUTION. 22. A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains fixed. The axis of the sphere is the fixed straight line about which the semicircle revolves. The centre of... | |
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A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains unmoved. 
