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Quadrilaterals with area formula ![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20171030062944548-0836:S0025557200004733:S0025557200004733_inline1.gif?pub-status=live)
Published online by Cambridge University Press: 23 January 2015
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- Copyright © The Mathematical Association 2012