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圆周长与圆面积两个概念很容易混淆。为让学生区别,在复习这两个概念时,我采用直观对比的方法,使教学收到了较好的效果。首先,出示用细铁丝围成的圆圈和一个与铁丝圆圈同样大小的圆纸板,教师分别在铁丝圆圈和纸板上撒小纸屑。学生从直观、对比中发现,在细铁丝圆圈上撤的纸屑都掉到地上去了,而在圆纸板上撒的纸屑都留在纸板上。
Circle circumference and circular area two concepts are easy to confuse. In order to make the difference between students, when reviewing these two concepts, I used the method of visual comparison to make the teaching received good results. First of all, a circle surrounded by a thin wire and a round cardboard of the same size as a wire circle were produced. The teacher dusted the scrap paper on the wire circle and the cardboard, respectively. Students from an intuitive comparison found that in the thin wire circle up the scraps of paper fell to the ground, while the paperboard scattered in the cardboard are left on the cardboard.