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図
mathworld.wolfram.com/RationalQuadrilateral
mathworld.wolfram.com/RationalQuadrilateral
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図３，４
geom.uiuc.edu/docs/reference/CRC-formulas/node23
geom.uiuc.edu/docs/reference/CRC-formulas/node23
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図５
ask-math.com/herons-formula
ask-math.com/herons-formula
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