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A spherical surface is the set of all points in space that are at a distance r from a fixed point, where (r > 0). A spherical cap is part of a spherical surface formed by the intersection of the spherical surface and a plane, where the boundary of the plane intersects the spherical surface along a circle with radius ρ. A spherical segment is a part of the sphere bounded by a spherical cap and the corresponding circular ring.
