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4/12 = 6/BC
1/3 = 6/BC
BC = 18 cm [b]
6. CF/CB = EF/AB
6/20 = 8/AD + 8
3/10 = 8/AD + 8
3AD + 24 = 80
3AD = 80 - 24
3AD = 56
AD = 56/3
AD = 18 2/3 [c]
semoga benar dan membantu..