 | Francis Nichols - 1811 - 162 σελίδες
...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... | |
 | Edward Bruce (bookseller.) - 1821 - 418 σελίδες
...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... | |
 | Rev. John Allen - 1822 - 516 σελίδες
...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.... | |
 | William Galbraith - 1827 - 412 σελίδες
...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... | |
 | John Bonnycastle - 1829 - 256 σελίδες
...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... | |
 | Ireland commissioners of nat. educ - 1834 - 370 σελίδες
...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... | |
 | William Galbraith - 1834 - 454 σελίδες
...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... | |
 | Commissioners of National Education in Ireland - 1837 - 290 σελίδες
...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... | |
 | A. Bell - 1837 - 180 σελίδες
...the fourth by pentagons ; and the fifth by equilateral triangles. 10. A sphere is a solid described by the revolution of a semicircle .about its diameter, which remains fixed. The axis of the sphere is the fixed diameter albout which the semicircle revolves ; and its centre... | |
 | Thomas Holliday - 1838 - 404 σελίδες
...parallel to each other, and its sides four trapezoids. 13. A sphere or globe is a solid, generated by the revolution of a semicircle about its diameter, which remains fixed. 14. The diameter of a sphere is any straight line passing through the centre, and terminating in each... | |
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The sphere may be conceived to be formed by the revolution of a semicircle about its diameter, which remains fixed. 
