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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).
(4.25 / 4 votes)Area = (π/4) * (D2 - d2)
A = (π/4) * (D2 - d2) =
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