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接線と平行な直線を引いて、
長方形と直角三角形に分けます

ウナ

詳しく教えてくださりありがとうございます!!

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x^2 + (7 - 3)^2 = 12^2

x^2 + 16 = 144

x^2 = 128

x = \sqrt{128} = 8\sqrt{2}
答えは8√2
だと思いますー

ウナ

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