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円柱じゃなくて上に伸ばして円錐にして考えます
ABとDCの延長上の交点をPとすれば△PAD∽△PBC
相似比2:4=1:2なの△PADの高さは4cm △PBCの高さは8cm
16π×8×1/3－4π×4×1/3=112π/3
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とっても分かりやすい回答ありがとうございます！
やっと理解できました😁