The Essentials of Geometry

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D.C. Heath & Company, 1899 - Geometry - 395 pages
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Page 371 - A zone is a portion of the surface of a sphere included between two parallel planes.
Page 336 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The...
Page 328 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Page 243 - The perpendicular is the shortest line that can be drawn from a point to a straight line.
Page 325 - A right circular cone may be generated by the revolution of a right triangle about one of its legs as an axis.
Page 297 - ... pyramids are to each other as the products of their bases by their altitudes.
Page 256 - If two planes are perpendicular to each other, a straight line drawn in one of them, perpendicular to their intersection, is perpendicular to the other.
Page 261 - The projection of a point on a plane is the foot of the perpendicular from the point to the plane.
Page 290 - DEF. The slant height of a regular pyramid is the altitude of any one of the lateral faces.
Page 248 - If one of two parallel lines is perpendicular to a plane, the other is also perpendicular to the plane.

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