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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龙枯鸣1516直径是20分米,高是40分米把下面这个圆柱体按1:200的比例尺画出它的表面展开图
訾娣枝17133889226 ______ 20分米=200厘米 40分米=400厘米 图上直径:200÷200=1厘米 侧面展开长方形的长:3.14*1=3.14厘米 侧面展开长方形的宽(也就是圆柱的高):400÷200=2厘米 按照以上数据画图即可

龙枯鸣1516一个圆柱体体面半径是2厘米,高是3厘米.怎么画出他它的两个底面和侧面的展开图 -
訾娣枝17133889226 ______[答案] 画两个半径为2cm的圆、画一个长是3cm;宽为半径为2cm的圆的周长的长方形

龙枯鸣1516一个直径2厘米,高3米的圆柱体展开图怎么画?急急急急急急急急急急急急急急急急急急急急急急急急! -
訾娣枝17133889226 ______[答案] 其展开后的图形为一个长方形与两个圆的组合体,其中长方形的长为原圆柱体的底面的周长 2π cm ,宽为 圆柱的高 3cm ,两个圆的大小分别为圆柱两个底面的大小 π(直径为 1 ).(另,长方形的长宽可互换)

龙枯鸣1516(1)求下面图形的实际面积是多少平方米?,比例尺1200.(2)画一个底面直径是2厘米、高3厘米的圆柱体的表面展开图(要在图上标明尺寸),再求出表面积. -
訾娣枝17133889226 ______[答案] (1)200厘米=2米, 2*6=12(米),2*4=8(米), 12*8÷2=48(平方米); 答:三角形的实际面积是48平方米; (2)如图所示,即为所要求画的圆柱的表面展开图: , 圆柱的表面积:3.14*2*3+3.14*( 2 2)2*2, =18.84+6.28, =25.12(平方厘米)...

龙枯鸣1516圆柱高是2厘米,底面半径是1厘米,侧面展开图怎么画 今天就要 -
訾娣枝17133889226 ______[答案] 侧面展开是一个长方形 长方形的长就是这个圆柱的底面周长 L=2*3.14*1=6.28厘米 宽就是圆柱的高 2厘米 画一个长6.28厘米,宽2厘米的长方形就可以了.

龙枯鸣1516(这个圆柱直径1厘米,高2厘米),在方格纸上画出这个圆柱的展开图.这个圆柱的表面积是多少?最好快点! -
訾娣枝17133889226 ______[答案] 先算周长,3.14*1=3.14cm 展开面 高*周长=6.28平方厘米 再算圆柱上下底面积3.14*0.5*0.5*2=1.57平方厘米 表面积 6.28+1.57=7.85平方厘米

龙枯鸣1516圆柱体上有螺旋面 螺旋面展开图该怎么画 -
訾娣枝17133889226 ______ 先把圆柱展开,对应圆柱螺旋面取点然后在展开面取相应的点然后把点连在一起即可

龙枯鸣1516已知圆柱的全面积为600πcm2,母线长为20cm.(1)求它的底面半径;(2)画出它的表面展开图.(按1:10的比例) -
訾娣枝17133889226 ______[答案] (1)设它的底面半径为xcm,则它的底面周长为2πxcm. 根据题意得:2πr2+2πr*20=600π. 解得;r1=10,r2=-30(舍去). 故圆柱的底面半径为10cm. (2)如图所示:

龙枯鸣1516圆柱的侧面展开图是______,圆柱的表面展开图是_____. -
訾娣枝17133889226 ______[答案] 长方形 一个长方形和两个圆形

龙枯鸣1516圆柱的表面怎么画 -
訾娣枝17133889226 ______ 展开全部 绘制一条直线,斜的,然后用投影,投影到实体曲面上 还有一种方法是,先绘一个平面实体(厚度定小点).在面上画好线.最后用折弯实体.圈面圆柱.