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In mathematics, an annulus (the Latin word for "little ring" is anulus, with plural anuli) is a ring-shaped object, a region bounded by two concentric circles. The adjectival form is annular (as in annular eclipse).
Area = (π/4) * (D2 - d2)
A = (π/4) * (D2 - d2) =
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"Annulus Area" Calculators.net. STANDS4 LLC, 2023. Web. 30 Mar. 2023. <https://www.calculators.net/calculators/annulus-area>.
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