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a circle A dartboard is typically circular, with concentric rings inside, divided into pizza like wedges that distinguish the different point areas.
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There is one outer ring and 4 inner rings.
On most dartboards it is six (6), but some dartboards have concentric circles.
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The rings of an archery target are concentric circles.
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topographic
A flat lens made of a number of concentric rings, to reduce spherical aberration.
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