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笔者认真拜读了《中小学数学》(初中版)2011年第11期《关于教科书中的角的定义》一文及2012年第6期徐老师的《角的定义岂能更改》一文,感触很深.作为一名多年从事中学数学教学工作的教师,对“角的定义”教学,既有很多的思考,又有较多的困惑.为了寻找更确切、更合理、更能使学生理解的“角的定义”的叙述,参阅了各种版本的教科书和参考书.一致的定义是:有公共端点的两条射线组成的图形叫做
The author carefully read the “primary and secondary mathematics” (junior high school edition) 2011 eleventh “on the textbook definition of the angle” and 2012 sixth Xu teacher “angle definition can change” article, feeling very deep As a teacher engaged in teaching mathematics in middle school for many years, he has a lot of thinking and more confusion about the teaching of “definition of angle.” In order to find out more exact, more reasonable and more understandable students See the various versions of textbooks and reference books for a description of “angle definition.” A consistent definition is that a graph of two rays with a common endpoint is called