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A:半径r,高さh の円錐の体積が
   (1/3)πr²h

B:半径3r,高さh の円錐の体積が
   (1/3)π(3r)²h=(1/3)π・(9r²)h

 高さを変えず底面の半径が3倍になると,
  体積は9倍になることから
 
 Bの体積は,32π×9=288π

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