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【公式】(柱の体積)=(底面の面積)×(高さ)
なので、
480(㎤)=(底面の円の面積)×8(㎝)
よって
(底面の円の面積)=60(㎠)
【公式】(円の面積)=(半径)^2×(円周率)
なので
60(㎠)=(半径)^2×3.14
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