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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*

** Circumference** is a lot of points on a surface, equally displaced from a point of this surface which is the center of circumference.

** Circle, disc ** is a part of the surface places in the inner part of a circumference.

The ** area of a circle, disc ** by radius, is equal to the product betwee the values of π and its square of the radius.

where:

r — the radius of a circle, disc.

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

context information: contemporary and archaic unit of measurement of area