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S=1/2absinθの公式を用いると
△OAB=1/2×2×2×sin150°=1
△OBC=1/2×2×2(×sin90°)=2
△OCA=1/2×2×2×sin120°=√3
より合計は3+√3
となります。

瑠歌

ありがとうございました🙇‍♀️

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