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作为平面几何中的基本图形,四边形以其基本概念、基本性质构成初中数学“图形与空间”领域学习的主干内容.在四边形的学习中,我们
As a basic figure in the plane geometry, the quadrilateral constitutes the main content of junior middle school mathematics “graphics and space” field learning with its basic concepts and basic properties. In quadrangular learning, we