English: Diagram showing a sphere of radius R cut by a pair of parallel planes a distance h apart. Provided neither plane is tangent to the sphere, this forms a spherical segment of two bases. Also called a spherical frustum. If one plane is tangent, then a spherical cap is formed. If both are tangent, then we recover the sphere.
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Captions
3D drawing of formation and characteristics of spherical segment (of two bases).