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四边形是“空间与图形”这一核心知识块中的重要内容,包括平行四边形、矩形、菱形、正方形、特殊梯形．主要掌握它们的性质、判定、多边形的内角和与外角和公式、平面图形的密铺、中心对称图形等．在中考命题中,既有对四边形相关基础知识和基本技能的单独考查,也有对三角形、相似形和圆的综合考查．现结合2005年和2006年相关中考题,对有关考点进行详细解析．
The quadrilateral is an important part of the “space and graphics” core knowledge block, including parallelograms, rectangles, rhombuses, squares, and special trapezoids. Mainly grasp their properties, judgments, internal angles of polygons, and external angles and formulas, close-packed graphics, and center symmetrical graphics. In the examination proposition, there is a separate examination of the basic knowledge and basic skills related to the quadrilateral, as well as a comprehensive examination of triangles, similar shapes and circles. The relevant examination questions in 2005 and 2006 are now combined to analyze the relevant test sites in detail.