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在新的八年制学校数学教学大綱的說明中,很注意让“学生經常运用最合理的作图方法”。但因为到現在为止,在教学法的书籍中几乎沒有指出这点。那么,不能說教师在实际教学中已經运用了最合理的作图方法。經驗証明,当存在較簡单的作图方法时,学生通常还是利用过去的方法。我們来举几个例子: 1.利用直尺作角的平分綫。利用双面直尺很容易求得与角的两边等距离的二直綫的交点M(图1a,b)。所求的点同角的頂点A一起就决定了角平分綫。
In the explanation of the new mathematics syllabus for the eight-year school, it was noted that “students often use the most reasonable method of drawing”. However, as of now, almost nothing has been pointed out in books on pedagogy. Then, we cannot say that teachers have used the most reasonable mapping method in actual teaching. Experience has shown that when there are simpler mapping methods, students usually use the past methods. Let us give a few examples: 1. Use a ruler as the bisector of the angle. Using the double-sided ruler, it is easy to find the point of intersection M (Fig. 1a, b) of the two straight lines equidistant from both sides of the corner. The desired point, together with the vertex A of the angle, determines the angle bisector.