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35/140 = 14/ x
35*x=14*140
35x=1960
x= 1960/35
x=56
COD=CD
CD=AB/AOB × COD
CD=14/35 × 140
CD=(14 × 140) : 35
CD=1960 : 35
CD=56 cm, jadi panjang busur CD adalah 56 cm