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在初中几何学中,作圖的問題,如作一已知角的平分綫,作定綫段的垂直平分綫,已知三边作一三角形等等問題,这些簡易作圖題,我們叫它基本作圖題,常常是解較複雜的作图題時,必須用來作根据的,除掉基本作圖題外,要解决各种較複雜的作圖題,找尋所求圖形的作法,就决不是一看題目就能立刻得到的,必須通过適当的思考,这就是作圖解析,解作圖題的方法很多,但在初中所学到的方法,主要有:(1)交軌法,(2)奠基法,(3)平移法三种。現在來談談我对这些方法怎样進行教学的。
In junior geometry, the problems of drawing, such as the bisector of a known angle, the vertical bisector of the given line segment, and the fact that the three sides are known as a triangle, etc., these simple drafting questions, we call it The basic drawing question is often used to solve complex drawing questions and must be used as a basis. In addition to basic drawing questions, it is necessary to solve a variety of more complicated drawing questions and find the way of seeking the figures. It is by no means a matter of immediate access to the subject. It must be properly thought out. This is a lot of ways to solve the problem. There are many ways to solve the problem. However, the methods learned in junior high school are: (1) the method of crossing, (2) Foundation laying method, (3) Three translation methods. Let’s talk about how I teach these methods.