为落实“双减”政策中减负增效的实践作业要求，探索实现数学新课程标准中培养学生创新精神和实践能力的这一重要目标之路，渭南高新区第一小学六年级数学老师结合本学期“圆柱和圆锥”教学内容，设计了“玩转柱锥”为主题的实践作业活动。

活动一：滚一滚

利用滚动法求圆柱的侧面面积，学生通过观察滚动所形成的图形，进一步了解圆柱侧面的特性。

活动二：剪一剪

学生利用现成的圆柱模型，沿着不同方向将侧面剪开，观察比较展开图的异同点，并体验圆柱侧面积、表面积计算公式的推导过程。

活动三：切一切

学生按不同方式将生活中的“圆柱”和“圆锥”切开，探究截面，了解“截面”的产生过程，体会“面源于体”。

活动四：拼一拼

我们能把一个圆采用“化曲为直”的思想方法推导面积计算公式，同样，让学生用转化思想，通过动手实践，推导圆柱体积计算公式。

活动五：做一做

学生在了解了圆柱、圆锥特点之后，制作圆柱与圆锥创意作品，提高学生的实际操作能力，让学生充分参与到“做数学”的活动中。

活动六：画一画

圆柱与圆锥知识点多而杂，但知识点之间不是孤立的，让学生从多维度对圆柱和圆锥的知识点进行整理，找出知识点之间联系，绘制思维导图，编织自己的知识网。

此次实践活动中，同学们不断在做中学，学中思，思中悟，进一步理解了圆柱和圆锥的特征，发现了两者之间的联系和区别，发展了空间想象能力、逻辑推理能力，体会了数学的应用价值，让学生得以跳出课堂，放飞手脑，去探索更广阔的数学世界!

撰稿：冯琳

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荀贩钢2428怎样用硬纸做圆柱体和圆锥体?帮帮忙呀. -
凌钱咱15242485920 ______ 做圆柱,先在纸上画个圆,剪出两个相同的圆后,算出圆的周长(圆柱侧面展开图的长).由于纸的厚度的影响,且制作时要进行粘贴,所以在见侧面展开图时的长要更长一点.至于圆柱的高,自己可以决定.然后依照剪下的圆,调节圆柱侧面的大小并粘贴成一个筒.最后,粘上两个圆. 做圆锥,先剪下一个大圆作为侧面.从圆上任意一点开始,到圆心剪下来,把两边拉拢起来,形成一个圆锥,粘贴定型后,把它放在纸上描出地面后剪下并粘贴.(注:要把底面做大些,否则不能粘上) 王可歆真负责,做寒假作业都这么认真!

荀贩钢2428怎样做圆锥和圆柱 -
凌钱咱15242485920 ______ 底面周长是2*pi*r,pi=3.14,所以r=5/2 根据勾股定理,得到,圆锥顶点到底面所在圆上任意一点的距离都是根号5平方加上(5/2)平方,所以算出来是二分之五根号五. 作底面半径为5/2的圆,过圆心作圆所在平面的高,高是5,过顶点构造圆锥.

荀贩钢2428过去加工圆锥,都是先加工一个与圆锥等底等高的圆柱,然后把它削成圆锥.李教授发明了一种新方法,可以把材料直接加工成圆锥.以加工底面半径20CM,高30CM的圆锥为例,采用新方法,可以节省多少立方厘米的材
凌钱咱15242485920 ______ 分析 先加工一个与圆锥等底等高的圆柱,然后把它削成圆锥.等底等高的圆柱体积为3份,圆锥体积为1份,然后把圆柱削成圆锥的过程要去掉2份,现在直接制作圆锥,就节省了这2份材料.也就是说节省的材料是圆锥体积的2倍.圆柱体积=3.14*20²*30=37680立方厘米圆锥体积=37680/3=12560立方厘米节省=37680-12560=25120立方厘米

荀贩钢2428圆锥和圆柱的制作 -
凌钱咱15242485920 ______ 圆柱剪个长方形就可以.圆锥剪个三角形. 圆锥剪个扇形吧,LS的.圆柱是剪个长方形.

荀贩钢2428圆柱圆锥的做法 -
凌钱咱15242485920 ______ 你找个卷式纸巾中间的纸筒,外面裹上一层白纸,用胶纸缠好 圆锥要用一张小一点的白纸来卷,把衔接处粘好,底部用剪刀剪整齐

荀贩钢2428怎样做一个底面积和高相等的圆柱体,圆锥体
凌钱咱15242485920 ______ 做一个边长分别为a、b的长方形,把a边卷起来就是底面周长为a,高为b的圆柱体 以(2/√3)b为半径做一扇形,其扇形的圆弧长为a,把两边卷起来就是底面周长为a,高为b的圆锥体

荀贩钢2428圆柱和圆锥【要过程】
凌钱咱15242485920 ______ 解设:圆锥的高为X厘米 解设:圆锥的高为X 三分之一*25=(6.28÷3.14÷2)*2*6 三分之二十五X=1884 X=226.08

荀贩钢2428怎样才能做出一样的高的圆柱和圆锥?
凌钱咱15242485920 ______ 先做圆锥 然后再另切一个圆柱,等高就行了

荀贩钢2428怎么做等高等体积的圆柱和圆锥
凌钱咱15242485920 ______ 让圆锥的底面积是圆柱的3倍即可

荀贩钢2428圆锥圆柱的做法 -
凌钱咱15242485920 ______ 你找个卷式纸巾中间的纸筒,外面裹上一层白纸,用胶纸缠好 圆锥要用一张小一点的白纸来卷,把衔接处粘好,底部用剪刀剪整齐