人的认识过程是从感性认识到理性认识的转化过程。感性知识可以通过直观的教学方式形成。因此教师要根据教材的内容,恰当地选择直观教学的方式,并注重培养和发展学生观察能力,才能使学生获得的感性知识更完善,从而奠定他们对事物的抽象思维的基础,促使感性认识到理性认识的转化。本文试通过“三角形的内角和定理”和“弦切角度数定理”两个课题,各自两种不同教法的对比,说明在课堂教学中,如何恰当地应用直观教学方式,既传授知识,又培养能力,发展智力。“三角形的内角和定理”一课,有下面两种教法。其中一种方法是,先通过演示图(一)所示的“三角形的内角和定理”的模型(图中∠A、∠B、∠C按点划线折叠后,分别与∠1、∠2、∠3重合),引导学生观察得到“三角形三个内角的和等于180°”的命题。继而丢开 The process of human cognition is the process of transformation from perceptual knowledge to rational knowledge. Perceptual knowledge can be formed through intuitive teaching methods. Therefore, according to the content of teaching materials, teachers should appropriately choose the way of direct teaching, and pay attention to cultivating and developing students’ observation skills. Only in this way can the students obtain more perceptual knowledge, thereby laying the foundation for their abstract thinking on things, and promoting perceptual understanding. The conversion of rational knowledge. In this paper, we try to use the “triangle inner angle and theorem” and “chord angle number theorem” two subjects, the comparison of the two different teaching methods, to illustrate how to apply the intuitive teaching method in classroom teaching, not only impart knowledge, but also Cultivate ability and develop intelligence. The lesson “Interior angles and theorem of triangles” has the following two teaching methods. One of the methods is to first pass the model of “triangle internal angle and theorem” shown in figure (1) (in the figure, ∠A, ∠B, and ∠C are folded by dot-dash lines, respectively, with ∠1 and ∠2. ∠ ∠ 重 重 重 重 重 重 重 重 重 重 ∠ ∠ , , , , , , , , , , , , ,. Then throw away