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円錐の体積=底面積×高さ÷3
円錐の底面積(円の面積)=半径×半径×π
今回、底面の円の半径は9なので
円錐の底面積は9×9×π
円錐の体積=底面積×高さ÷3より
円錐の体積=9×9×π×h÷3=27πh

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底面の半径を9、高さをhとおいた時の円錐の体積です

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