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unit of measure: the base unit | the supplementary unit | the derived unit

*geometry: the area of a flat figure | the area of a solid | the volume of the solid*

A ** sphere, spherical surface ** is a set of points in space, equally displaced from a certain point – center of the sphere.

The ** area of a sphere ** is equal to the area of a circle with the same diameter multiplied by four.

where:

r — the radius of a sphere.

*For separation of number integers and decimals, use the symbol – point [.]*

context information: contemporary and archaic unit of measurement of area