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平面几何教学,就是要使学生能够认识到所给图形的性质,引导学生结合所给条件去分析问题和解决问题,培养学生的推理论证能力.但在认识图形或是构造图形的过程中,学生会产生一些错误.为了减少学生面对几何图形的出错现象,笔者在《四边形》内容的教学中,就学生容易出现的典型错误举例剖析,希望能引起同学们的注意.一、片面理解图形忽视条件导致错解例1如图1所示,假设四边形ABCD的四条边上布满了奶酪,它们分布情况是:AB=
Plane geometry teaching is to enable students to recognize the nature of the graphics given to guide students to combine the given conditions to analyze problems and solve problems and develop students’ ability of reasoning and argumentation.But in understanding the graphics or the construction of graphics in the process, students will In order to reduce the students in the face of geometric error phenomenon, the author in the “quadrilateral” content of the teaching, students typical examples of errors prone to analysis, hoping to arouse the attention of students.One, one-sided understanding of the conditions of graphic neglect As a result, the four sides of the quadrilateral ABCD are covered with cheese as shown in FIG. 1, and their distribution is: AB =