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以3為軸旋轉一周得到的是圓錐體.其體積是:1/3派*3^2*4=24派. 以4為軸旋轉一周得到的是圓錐體.其體積是:1/3派*4^2*3=32派. 以5為軸旋轉一周得到的是有公共底面的兩個圓錐的組合體.其體積是:1/3派(5/12)^2*5 =48派/5.
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