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AD//BCより錯角だから
∠OAD=∠OCB
∠ADO=∠CBO
よって△AOD∽△COB
AD:CB=4:8=1:2
よって相似比は1:2
AO:CO=1:2 で 全体が6cmだから、AO=2cm
DO:BO=1:2 で 全体が9cmだから、BO=6cm
間違っていたらすみません🙇‍♂️

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