Spherical Segment of Two Bases 
a part of a sphere bounded by two parallel planes intersecting the sphere (see Figure 1). The volume of such a solid is V = πh(3a2 + 3b2 + h2)/6,
Figure 1
and the area of the solid’s curved surface, which is called a zone, is S = 2πRh; here, R is the radius of the sphere, h is the distance between the planes of the bases, and a and b are the radii of the bases.
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