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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 area of a circle, disc

by radius

Definition:

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.

Computing relationship:

where:

r — the radius of a circle, disc.

Calculator: the area of a circle, disc


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

the radius of a circle, disc — r

 


the area of a circle, disc =

 

 

context information: contemporary and archaic unit of measurement of area