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一、要点回顾正方形是一种更特殊的平行四边形,它具有矩形和菱形的所有性质.平行四边形及特殊的平行四边形的定义、特征和识别方法是重点,平行四边形与特殊的平行四边形之间的联系与区别是难点.二、知识结构三、知能要点1.定义:有一个角是直角的菱形是正方形;有一组邻边相等的矩形是正方形;有一个角是直角并且有一组邻边相等的平行四边形是正方形.2.特征:四条边都相等,四个角都是直角;两条对角线相等,并且互相垂直平分;每一条对角线都平分一组对角;既是中心对称图形,又是轴对称图形.
First, the main point Recall that the square is a more special parallelogram, which has all the properties of rectangular and diamond parallelogram and special parallelogram definition, characteristics and identification method is the focus of the parallelogram and the special parallelogram between Contact and distinction is a difficult point. Second, the structure of knowledge Third, knowledgeable points 1 Definition: a corner is a square diamond is a square; a group of adjacent rectangles is adjacent to an equal square; a corner is a right angle and has a group of adjacent equal Parallelogram is a square .2 Features: four sides are equal, the four corners are at right angles; two diagonal equal and perpendicular bisect each other; each diagonal line bisect a diagonal; both the center of the symmetrical graphics, Axisymmetric graphics.