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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*

The ** sector of a circle, disc ** by the length of the sector’s arc, is a part of a circumference that is bounded by the arc and two radiuses from the limit points of that arc.

The ** area of a sector of a circle, disc** is equal to the product of one half of arc’s length and the radius of the circle, disc.

where:

r — the radius of a circle, disc;

p — the arc 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