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△OAD≡△OAFより、
AD=AF(=5)
同様に、△OBD≡△OBEより、
BD=BE(=13-4=9)・・・①
また、△OCE≡△OCFより、
CE=CF(=9-4=5)・・・②
よって、①②より、
BC=BE+EC=9+5=14
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