Zone of a Sphere

The zone of a sphere, also called spherical zone, or simply zone, is the spherical surface of the sphere between two parallel planes cutting the sphere.

Zone of a sphere

In the figure above, we show two spherical zones using the color red and the color green.

A spherical zone can also have just 1 plane. In this case, it is the spherical surface between 1 plane and the end of the sphere. 

In the figure below, the zone of the sphere is shown with the color orange.

Spherical zone
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