Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 134
33. One of the planes whichbound a zone may become tangentto the sphere; in which case thezone will have but one base. Thus,if one plane be tangent to the sphereat A, and another plane cut it in thecircle DF, the zone included be-tween them, will have but one base.12 … 134 GEOMETRY Of the P i ; s m 34. A spherical segment is a portion of the solid sphere in-cluded between two parallel planes. These parallel planesare its bases. If one of the planes is tangent to the sphere,the segment will have but one base. 35. The altitude of a zone or segment, is the distance…
Geometry · Plane trigonometry
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