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人教版数学六年级下册12页例2的内容是:圆柱的侧面展开后是什么形状?剪一剪,再展开。教科书提供的探究过程如下:1.以图示引导学生剪开圆柱形罐头盒的商标纸,并在商标纸上沿着圆柱的高画了一条红色的虚线,意在引导学生沿着圆柱的高展开圆柱的侧面。2.以图示展现圆柱的侧面沿着高展开是长方形,并在图示的左侧辅以文字说明,圆柱的侧面展开后是长方形。3.提出问题,长方形的长、宽与什么有关?有什么关系?4,以图示及文字通过操作验证比较,得出结论,长方形的长等于圆柱的底面周长,宽
PEP sixth grade under the volume 12 Page 2 Example 2 is: What is the shape of the cylinder after the expansion? Scissors, and then expand. The textbook provides an inquiry process as follows: 1. Students are instructed to cut open the trademarked paper of cylindrical cans and draw a dotted red line along the height of the column on the label paper to guide the student along the height of the column Expand the side of the cylinder. 2. The figure shows the side of the cylinder along the high expansion is a rectangle, and the left side of the diagram is supplemented by text description, cylindrical side after the expansion is rectangular. 3. Ask the question, what is the relationship between the length and the width of the rectangle and what is related to it? 4, By comparing the figure with the text through the operation verification, it is concluded that the length of the rectangle is equal to the circumference of the bottom of the cylinder,