# Area of an Annulus

## Description

In mathematics, an annulus (the Latin word for “little ring”, with plural annuli) is a ring-shaped object, especially a region bounded by two concentric circles. The adjectival form is annular (as in annular eclipse).

Related formulas## Variables

A | area of an annulus (m^{2}) |

π | pi |

R | larger circle radius (m) |

r | smaller circle radius (m) |