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(一)用动的观点进行教学: 当学生一看到旋转这两个字,就会想到动的概念,因此这一章必须运用动的观点来进行教学。例如:讲旋转体、圆柱、圆锥、圆台和球的定义时;可用铅皮剪成各种不同形状的图形(如图1),一边焊上一根鉄丝,在上课时把它们装到手摇钻(如图2)里旋转给学生看,使学生清楚地看到,旋转体是由一个平面图形,以同平面内的一条直綫为轴旋转而得到。圆柱、圆锥、圆台和球分别是由矩形、直角三角形、直角梯形和半圆旋转而得到。
(a) Teaching with a dynamic point of view: When the student sees the rotation of the two words, he will think of the concept of movement. Therefore, this chapter must use dynamic viewpoints for teaching. For example: When defining the definition of a rotating body, a cylinder, a cone, a circular table, and a ball, a lead sheet can be cut into various shapes (Fig. 1). A wire is welded on one side and they are hand-wound during the class. The drill (as shown in Figure 2) rotates to show the students, so that the students can clearly see that the rotating body is a plane figure, which is obtained by rotating a line in the same plane as the axis. Cylinders, cones, circles, and balls are obtained by rotating a rectangle, a right triangle, a right trapezoid, and a semicircle, respectively.