## Spherical zone

It is the part of the sphere generated as follows:

The area of the spherical zone is given by:

## Spherical cap

It is the part of the sphere generated as follows:

The area of the spherical cap is given by:

## Spherical spindle

The spindle is a part of the spherical surface that is obtained by rotating a semicircle of an angle. around its axis:

The area of the spindle can be obtained by a simple three rule:

## Spherical wedge

Part of the sphere obtained by rotating a semicircle about its axis from an angle :

Wedge volume can be obtained by a simple three-rule:

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