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四边形是初中几何的重要内容之一,也是中考的必考内容,它既是三角形知识的扩展,又是学好相似形和圆的基础.但在四边形的证题过程中,不少同学都容易犯一个错误——漏证“三点共线”.一、证题过程中漏证“三点共线”例1从菱形两条对角线的交点分别向各边引垂线,求证连接各垂足的?
The quadrilateral is one of the important contents of junior high school geometry, and it is also an examination content of the middle school exam. It is not only an extension of the triangle knowledge, but also a foundation for learning similar shapes and circles. However, in the course of the verification of the quadrilateral, many students easily commit a crime. Error - missing card “three points collinear.” First, the card during the process of missing evidence “three points collinear” Example 1 from the intersection of diamond two diagonal lines to each side of the vertical line, verifying the connection of each foot of?