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" A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains fixed. "
Mathematical and Astronomical Tables: For the Use of Students in Mathematics ... - Page 70
by William Galbraith - 1834 - 428 pages
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Mathematics: Compiled from the Best Authors and Intended to be the ..., Volume 2

Mathematics - 1801 - 658 pages
...equally distant from a point within, call- LJL!| ed the centre. The sphere may -jj', be conceived to be formed by the revolution of a semicircle about its diameter, which remains fixed. 9. The axis of a solid is a line, drawn from the midd« of one end to the middle of the opposite end...
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A Treatise of Plane and Spherical Trigonometry: In Theory and Practice ...

Francis Nichols - Plane trigonometry - 1811 - 162 pages
...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...
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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...
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Euclid's Elements of Geometry: The Six First Books. To which are Added ...

Rev. John Allen - Astronomy - 1822 - 516 pages
...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....
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Mathematical and Astronomical Tables: For the Use of Students of Mathematics ...

William Galbraith - Astronomy - 1827 - 412 pages
...Properties. 1. Spherical Trigonometry is that branch of mathematics by which we are enabled, in au cases, where three of the six parts of a triangle...sphere is the straight line about which the semicircle revolves. PROPOSITION I. 6. If a sphere be cut by a plane, the section will be a circle. Let the sphere...
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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...
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A treatise on practical geometry, mensuration, conic sections, gauging, and ...

Ireland commissioners of nat. educ - 1834 - 370 pages
...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...
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A Treatise on Mensuration for the Use of Schools

Commissioners of National Education in Ireland - Measurement - 1837 - 284 pages
...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. 1 1 . When the axis is perpendicular...
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Solid and Spherical Geometry and Conic Sections: Being a Treatise on the ...

A. Bell - Conic sections - 1837 - 180 pages
...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...
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A complete treatise on practical land-surveying

Thomas Holliday - Surveying - 1838 - 404 pages
...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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