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一、问题提出一节初一的公开课上,教师在让学生讨论了测量圆的周长的方法后,给学生提供直径不同的圆硬纸片材料,探究圆的周长与直径有什么关系,并这样导入:“我们知道正方形周长是边长的4倍,那么圆的周长与直径是否也存在一定的倍数关系呢?这个问题让同学们自己去发现,请同学们分组测量圆片,填好实验报告单。”这时,居然有很多学生小声地说:“我知道的,圆的周长是直径的3倍多一点。”“我知道圆的周长是直径的3.14倍。”“圆的周长除以直径等于……”若干学生都在
First, the question raised a first day of the open class, the teacher let students discuss the method of measuring the circumference of the circle, to provide students with different diameters of round hard cardboard material, to explore the circle circumference and diameter have anything to do , And import: “We know that the perimeter of the square is four times the length of the perimeter, then the perimeter of the circle and the diameter of the existence of a certain fold relationship? This problem let students find themselves, ”And at this moment, there are actually many students whispered:“ I know that the circumference of the circle is more than three times the diameter. ”“ I know the circumference of the circle is 3.14 times the diameter. ”“ The circumference of the circle is divided by the diameter equal to ... ”Several students are at