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在教学中经常运用直观教具,能引起学生生动的感觉和学习的积极性的,尤其在几何课中可以培养学生的想像力。为了使几何教学和学生几何观念的发展相适合,们我曾利用玻璃制作了一些教具,试验的结果我们认为有以下面一些优点: 一、能使图形借玻璃的移动而移动,从而培养学生动的世界观以及理解图形间的变化关系。例如: 1) 讲两圆位置关系时,为使学生认识两圆位置的变化所引起两圆半径和差与两圆心间距离的关系的变化情况及其逆,首先在两块玻璃上分别画好半径不等的两圆如图1、图2。
Visual teaching aids are often used in teaching, which can arouse students’ vivid feelings and enthusiasm for learning, especially in geometry lessons. In order to adapt the geometric teaching to the development of student’s geometric concepts, I have used glass to produce some teaching aids. The results of the experiment we think have the following advantages: First, the graphics can be moved by the movement of the glass, so as to train students to move. The worldview and understanding the changing relationship between graphics. For example: 1) When speaking about the relationship between two circles, in order to enable students to recognize the changes in the relationship between the radius of the two circles and the difference between the two circles and the distance between the two circles, and the inverse of the relationship between the two circles, first paint the two glasses separately. The two circles with different radii are shown in Figure 1 and Figure 2.