OB/OC=OA/OD=AB/CD
OB/12=5/9=AB/15
OB/12=5/9
OB = (5*12)/9=20/3(dm)
OA/OAB/CD
5/9=AB/15
AB =(5*15)/9=25/3(dm)
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OB/OC=OA/OD=AB/CD
OB/12=5/9=AB/15
OB/12=5/9
OB = (5*12)/9=20/3(dm)
OA/OAB/CD
5/9=AB/15
AB =(5*15)/9=25/3(dm)