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trapezium [trapeziums]▼(polygon with no parallel sides and no equal sides)noun[UK: trə.ˈpiː.zɪəm] [US: trə.ˈpiː.ziəm]
quadrilateral [quadrilaterals]▼(polygon having four sides)noun[UK: ˌkwɒ.drɪ.ˈlæ.tə.rəl] [US: ˌkwɒ.drɪ.ˈlæ.tə.rəl]
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