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“三角形的三个内角的和等于180°”这个定理作为结论教给学生很容易。但是,仅知道结论是不行的。怎样通过讲解定理,教给学生认识事物的规律,使他们掌握思考问题的正确方法呢?针对初中学生习惯于接受现成知识,缺乏独立思考能力的特点,我们课前给学生布置了三道作业题,引导学生思考:1.作一个任意三角形,用量角器量出三个内角的度数,并计算三个内角的和;2.用纸板剪一个三角形,并剪下其中两个角,然
The “theorem that the sum of the three interior angles of a triangle equals 180 °” is as easy to teach to students as a conclusion. However, it is not enough to know the conclusion alone. How to understand the laws of things by teaching theorems so that they can grasp the correct way to think? For the junior high school students are accustomed to accepting ready-made knowledge and lack of ability to think independently, we arranged three assignments for students , To guide students to think: 1. Make an arbitrary triangle, using the protractor to measure the degree of the three interior angles and calculate the sum of the three interior angles; 2. Cut a triangle with a cardboard, and cut two of them,