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The '''annulus''', or '''annular region''', is the ringlike area bounded by two [[circle]]s, which are usually concentric (have the same center).
The '''annulus''', or '''annular region''', is the ringlike area bounded by two [[circle]]s, which are usually concentric (have the same center).
[[Category:geometry]]
[[Category:Geometry]]
[[Category:mathematics]]
[[Category:Mathematics]]