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字が汚いです。 役に少しでも

おもち

ありがとうございます!🙇‍♀️🙇‍♀️

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大きい円の半径はa+b
小さい円の半径はa-b
面積の和は
π(a+b)²+π(a-b)² =2π(a²+b²)

おもち

ありがとうございます!!

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