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EF: AB = BF: BF + FC = 7,5 + 11,25
4/10 = 7,5/7,5 + FC =18,75///
4(7,5 + FC) = 7,5 .10
30 + 4 FC = 75
4FC= 75
FC = 11,25
10/4 = 7,5 + FC/FC
10 FC = 4 (7,5 + FC)
10FC = 30 + 4FC
10FC - 4FC = 30
6FC = 30
FC = 5
maka BC = BF + FC = 7,5 + 5 = 12,5