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https://youtu.be/1QaG2cGs1xs?si=beqB1_a2bDPtT_QX
https://share.google/xLs8ak2aiIAIanlyq
台形や三角形の面積を求めるときのように
ひっくり返して引っ付けると
2つ分の直方体ができるので
それを2で割る
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