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重点难点易混易错点剖析复习重点:多边形的概念、内角和、外角和定理,平行四边形的概念、性质与识别,特殊平行四边形的性质与识别.复习难点:平行四边形和特殊平行四边形性质的联系与区别,在动态条件下对特殊平行四边形的识别.能够解决有关平移、折叠、旋转的四边形问题.易混易错点:矩形、菱形性质容易混淆,连接矩形对角线得到两对全等的等腰三角形,连接菱形的对角线得到四个全等的直角三角形.要记住当矩形的对角线夹角和菱形的内角是一些特殊角度时,矩形和菱形所特有的一些结
Key points Difficult to misuse Analysis of misdirected points: the concept of polygons, the angle and the outer corner and the theorem, the concept of parallelogram, nature and recognition, the nature and recognition of special parallelograms Review difficult: parallelogram and special parallelogram Contact and distinction, the recognition of special parallelogram under dynamic conditions can solve the problem of translation, folding, rotation of the quadrilateral. Easy to mix and error points: rectangular, rhombic easy to confuse the nature of the connection diagonal rectangular two pairs of congruent Of the isosceles triangle, connecting the rhombus of the diagonal to get four congruent right triangle.When remember that the angle between the diagonal of the rectangle and the inner angle of the rhombus is some special angle, the rectangle and the diamond-shaped some of the knot