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底面直徑為是高的9分之8,那麼高就是底面直徑的8分之9=9/8*4=9/2釐米. 圓錐體積=底面積*高*1/3=半徑的平方*π*高*1/3=2^2*π*9/2*1/3=6π立方釐米. 質量=密度*體積=7.8*6π≈147克.
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