The Elements of Solid Geometry: With Numerous Exercises

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Ginn, 1893 - Geometry, Solid - 126 pages
 

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Page 75 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.
Page 2 - A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane.
Page 3 - If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines.
Page 7 - If from the foot of a perpendicular to a plane a straight line is drawn at right angles to any line of the plane, and its intersection with that line is joined to any point of the perpendicular, this last line will be perpendicular to the line of the plane. Let...
Page 95 - The area of the surface generated by a straight line revolving about an axis in its plane, is equal to the...
Page 73 - The volume of a triangular prism is equal to the product of the area of a lateral face by one-half the perpendicular distance of that face from the opposite edge.
Page 85 - A spherical angle is measured by the arc of a great circle described from its vertex as a pole and included between its sides (produced if necessary). Let AB, AC be arcs of great circles intersecting at A; AB...
Page 87 - If two triangles have two sides and the included angle of one equal respectively to two sides and the included angle of the other, the triangles are equal.
Page 97 - TJie areas of the surfaces of two spheres are to each other as the squares of their radii, or as the squares of their diameters.
Page 13 - If two angles, not in the same plane, have their sides respectively parallel and lying in the same direction, they are equal and their planes are parallel. Let BA C,B'A...

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