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A geometric figure. In [mathematics], an annulus (the Latin word for "little ring", with plural annuli) is a ring-shaped geometric figure, or more [generally], a term used to name a ring-shaped object. It is also used to describe the area between two [concentric] circles. The adjectival form is annular (for example, an annular eclipse). The area of an annulus is the difference in the areas of the larger circle of radius R and the smaller one of radius r: A = \pi R^2 - \pi r^2 = \pi(R^2 - r^2)\,.
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