开发者_开发知识库四边形的定义是四条线段首尾相接围成的封闭图形。四边形不具有三角形的稳定性,易于变形。但正是由于四边形不稳定具有的活动性,使其在生活中有广泛的应用,如拉伸门等拉伸、折叠结构。连接四边形[详细]
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