特殊用法circumscribed quadrilateral1.外切四边形complete quadrilateral1.完全四线形, 完全四边形cyclic(al) quadrilateral1.联圆四边形inscribed quadrilateral1.内接四边形isosceles quadrilateral1.等腰四边形skew quadrilateral1.挠四边形trirectangular quadrilateral1.三直角四边形