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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 ring

by its radius

Definition:

A ring is the area bounded by two concentric circumferences on a plane.

The area of a ring is the product of the values of π and diference between the squares of the radius of both large and small circles.

The area of a ring by its radius

Computing relationship:

where:

r1 — the outer radius;

r2 — the inner radius.

Calculator: the area of a ring by its radius


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

the outer radius — r1

the inner radius — r2

 


the area of a ring by its radius =

 

 

context information: contemporary and archaic unit of measurement of area