Conway triangle notation defines
(1)
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where is the area of a reference triangle, and
(2)
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This gives the special cases
(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(10)
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(11)
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(12)
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where , , are side lengths, , , , are the corresponding angles, and is the Brocard angle.