Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 133
28. The diameter of a sphere isa line passing through the centre,and terminated by the circumferonce. Thus. AD is a diameter … BOOK VI. L33 Of the Sphere 29. All diameters of a sphere are equal to each other; andeach is double a radius. 30. The axis of a sphere is any line about which it re-volves ; and the points at which the axis meets the surface,ire called the poles. 31. A plane is tangent to a spherewhen it has but…
Geometry · Plane trigonometry
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