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The sphere may be conceived to be formed by the revolution of a semicircle about its diameter, which remains fixed.
Mathematics: Compiled from the Best Authors and Intended to be the Text-book ... - Page 83
1801

A Treatise of Plane and Spherical Trigonometry: In Theory and Practice ...

Francis Nichols - Plane trigonometry - 1811 - 162 pages
...surface, which is every where equally distant from a point within it called the centre. A sphere may be conceived to be formed by the revolution of a semicircle about its diameter, which remains unmoved, and is called the axis of the sphere. 2. A diameter of a sphere is a straight line passing...

An introduction to geography and astronomy, by the use of the globes and ...

Edward Bruce (bookseller.) - 1821 - 418 pages
...globe is a perfectly round body; its middle point is called the centre. A globe, or sphere, is a solid, formed by the revolution of a semicircle about its diameter, which remains fixed. The axis of a sphere is the right line about which the semicircle revolves. 6. A great circle divides...

Euclid's Elements of Geometry: The Six First Books. To which are Added ...

Rev. John Allen - Astronomy - 1822 - 516 pages
...sphere, is a right line drawn from the centre to any part of its surface. 16. When a sphere is supposed to be formed by the revolution of a semicircle about its diameter, which remains unmoved, the diameter, about which the semicircle revolves, is called, the axis of the sphere. 17....

Mathematical and Astronomical Tables: For the Use of Students of Mathematics ...

William Galbraith - Astronomy - 1827 - 412 pages
...angles alone ; while that of a spherical triangle always can. 3. A sphere or globe is a round body formed by the revolution of a semicircle about its diameter, which remains fixed. 4. The centre of the sphere is the same with that of the revolving semicircle. 5. The axis of the sphere...

An Introduction to Mensuration and Practical Geometry

John Bonnycastle - Geometry - 1829 - 256 pages
...quadrangular pyramid; when a pentagon, it is called a pentagonal pyramid, &c. 8. A sphere is a solid described by the revolution of a semicircle about its diameter, which remains fixed. 9. The centre of a sphere is a point within the figure, every where equally distant from the convex surface...

A treatise on practical geometry, mensuration, conic sections, gauging, and ...

Ireland commissioners of nat. educ - 1834 - 370 pages
...9. A cone is a round pyramid, having a circle for its base. 10. A sphere is a round solid, which may be conceived to be formed by the revolution of a semi-circle about its diameter which remains fixed. 11. The axis of a solid is a line joining the middle* o> both ends. 12. When the axis is perpendicular...

Mathematical and Astronomical Tables: For the Use of Students in Mathematics ...

William Galbraith - Astronomy - 1834 - 454 pages
...angles alone ; while that of a spherical triangle always can. 3. A sphere or globe is a round body formed by the revolution of a semicircle about its diameter, which remains fixed. 4. The centre of the sphere is the same with that of the revolving semicircle. 5. The axis of the sphere...

A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - Measurement - 1837 - 290 pages
...8. A cone is a round pyramid, having a circle for its base. 9. A sphere is a round solid, which may be conceived to be formed by the revolution of a semi-circle about its diameter which remains fixed. 10. The axis of a solid is a line joining the middle of both ends. 11. When the axis is perpendicular...