六年级数学下册1.3《圆柱的体积》课件1北师大版.ppt

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1、圆柱的体积,长方体的体积=长宽高,正方体的体积=棱长棱长棱长,1.拼成的长方体的体积与原来的圆柱体体积是否相等?,2.它的底面积变了吗?,3.它的高变了吗?,讨论题,底面积,想一想、填一填:,把圆柱体切割拼成近似( ),它们的( )相等。长方体的高就是圆柱体的( ),长方体的底面积就是圆柱体的( ),因为长方体的体积=( ),所以圆柱体的体积=( )。用字母“V”表示( ),“S”表示( ),“h”表示( ),那么,圆柱体体积用字母表示为( ),长方体,体积,高,底面积,底面积高,底面积高,体积,底面积,高,V=Sh,求出下面圆柱的体积。,S=60cm2,看图列式。,126,已知:S h 直求

2、 v r h 先求s 再求v d h 先求r 再求s 然后求v,一个圆柱形瓶子,底面周长是15.7厘米, 高是9厘米,它的体积是多少?,一、填表。,15,3,45,40,4,160,二、填空,1、一个长方体和一个圆柱的体积相等,高也相等,那么它们的底面积( )。 2、一根横截面面积是10平方厘米的圆柱形钢材,长是2米,它的体积是( )立方厘米。,相等,2000,三、判断对错。,、圆柱体体积与长方体体积相等。 ( )、长方体、正方体、圆柱体的体积都 可以用底面积乘高的方法来计算。 ( ),3、圆柱体的底面积越大,它的体积越大。,( ),4、圆柱体的高越长,它的体积越大。,( ),四、求下面圆柱的体积。(只列式不计算。),1、底面积24平方厘 米,高12厘米。,2,2、底面半径 2 厘 米, 高 5 厘米。,5,12,2412,3.14, 5,V =s h,直柱体的体积 = 底面积高,16平方米,8 米,9 米,15平方米,(1)你会计算它们的体积吗? (2)试写出它们的体积公式。,

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