六年级数学下册1.4《圆锥的体积》课件1北师大版.ppt

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圆锥的体积,圆柱的体积等于和它等底等高的圆锥的体积的3倍。,如果小麦堆的底面半径为2m,高为1.5m。小麦堆的体积是多少立方米?,6.28(m3),答:小麦堆的体积是6.28m3。,1.下图中,圆锥的体积与哪个圆柱的体积相等?说说你是怎么想的。,2.计算下面各圆锥的体积。,3.如图,测量中经常使用铅锤。这个铅锤的体积是多少立方厘米?(结果保留2位小数),26.17(cm3),4.有一座圆锥形帐篷,底面直径约5m,高约3.6m。 它的占地面积约是多少平方米? 它内部的空间约是多少立方米?,23.55(m3),3.14(52)2,19.625(m2),答:它的占地面积约是19.625平方米,,它内部的空间约是23.55立方米。,5.张大伯家有一堆小麦,堆成了圆锥形,张大伯量得它的底面周长是9.42m,高是2m,这堆小麦的体积是多少立方米?如果每立方米小麦的质量为700kg,这堆小麦约重约重多少千克?,底面积:3.14(9.423.142)27.065(m2),体积:,质量:,4.717003297(kg),答:这堆小麦约重约重3297千克。,6.一个圆柱形橡皮泥,底面积是12cm2,高是5cm。 如果把它捏成同样底面大小的圆锥,这个圆锥的高是多少? 如果把它捏成同样高的圆锥,这个圆锥的底面积是多少?,5315(cm),12336(cm2),通过今天的学习,你有什么收获?,

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