1、 圆圆 柱柱长方体长方体长方体的体积长方体的体积 圆柱的体积圆柱的体积底面积底面积底面积底面积高高 高高=拼成的长方体与原来的圆柱有什么关系?V=S hV=S h求下面圆柱的体积。(口答列式)底面积6平方分米,高5分米。V=sh=65底面半径3厘米,高3厘米。V=sh=33底面直径4分米,高3分米。V=sh=(42)3底面周长25.12厘米,高6厘米。V=sh=3.14(25.123.142)6 V=sh =0.61.2 =0.720.72 V=sh =0.253 =0.750.75 V=sh =(82)4 =164 =64 =64(cm)V=sh =(62)7 =97 =63 =63 (cm
2、)V=sh =(52)10 =6.2510 =62.5 =62.5 (cm)=63 =64=62.5 V=sh =35 =95 =45 =45 (dm)45 1=141.3(千克)(千克)r=2.52=1.25(cm)V=sh =3.141.251.259.25 =3.141.56259.25 =45.3828125 45.4(cm)8 12 V=sh =(82)12 =1612 =192 =192(立方厘米)192 1=192 (克)(克)把一个棱长把一个棱长2分米的正方体木块削成一分米的正方体木块削成一个体积最大的圆柱体,要削去多少立方厘个体积最大的圆柱体,要削去多少立方厘米的木屑?米的木屑?2222 V=sh =(22)2 =2 =2 (cm)V=a =222 =8(cm)削去削去:8 2 (cm)