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AD sejajar EF
maka BC dapat dicari dengan perbandingan,, ingat AD = BC :
BE/BA = EF/AD
2/3 = 1.8/AD
2AD = 1.8 * 3
2AD = 5.4
AD = 2.7 cm
maka karena AD = BC,, maka BC = 2.7 cm
Jawaban : B
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