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BC/6=AB/4
BC/6=12/4
BC=12×6/4
=3×6
=18
Jadi panjang BC adalah 18=B

Penyelesaian :

BC / 6 cm = AB / 4 cm
BC / 6 cm = 12 cm / 4 cm
BC = 12 cm / 4 cm × 6 cm
BC = 3 × 6 cm
BC = 18 cm

Jawaban : B