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「大円の面積-小円の面積=円環」10+2=12(メートル)(12/2)*(12/2)=36(メートル)36*3.14=113.04(平方メートル)──────大円の面積(10/2)*(10/2)=25(メートル)25*3.14=78.5(平方メートル)...
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