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AとCが重なるようにDEで折り曲げているので、
AE=CE=5cm
また、∠AED=∠CED=90度なので、
△ABC∽△AED から
AB:AE=BC:ED
→ 8:5=6:DE
→ DE=15/4

やっはー

ありがとうございます!!!

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