*MENU: home page*

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 ** 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.

where:

r_{1} — the outer radius;

r_{2} — the inner radius.

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

context information: contemporary and archaic unit of measurement of area