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点Aと辺BCの距離は3√3
BGHCの面積は6×3=18なので、
切り取った体積が18×3√3×1/3=18√3
全体の体積が6×3√3×1/2×6=54√3なので
答えは54√3-18√3=36√3じゃないですかね?

☺︎pd☺︎

分かりやすい!ありがとうございます!

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