In this sphere, the line D is the diameter. A diameter is a straight line drawn from the surface and after passing through the centre ending at the surface.

Every section made by a plane passed through a sphere is a circle. If the plane passes through the centre of a sphere, the plane section is a great circle; otherwise, the section is a small circle.

### Frustum of a Sphere

The portion of the surface of a sphere included between two
parallel planes, which intersect the sphere, is called a frustum. The distance
between the two planes is called height or thickness of the frustum.

The volume of a frustum of a sphere can be found using the formula below:

The surface area of a frustum of a sphere can be found using the formula below:

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