Reuleaux triangle
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What links here
Curve of constant width
Barbier's theorem
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Minkowski addition
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List of curves topics
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Manhole cover
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Heptagon
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Isoperimetric inequality
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List of mathematical shapes
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Equilateral polygon
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Fifty pence (British coin)
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Twenty pence (British coin)
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Equilateral triangle
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Coins of the pound sterling
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Pi
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Loonie
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Coin
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Circle
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