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4/6 = (4+3)/ BC
4(BC) = 6(4+3)
BC = 6(7) / 4 = 42/4
AD/AB = AE/AC
9/AB = 4/(4+3)
4(AB) = 9(4+3)
AB = 9(7)/4
AB = 63/4
AE = 4 cm
DE = 6 cm
CE = 3 cm
a) AE/AC = DE/BC
4/7 = 6/BC
BC = 7.6/4
BC = 10,5 cm
b) AD/AB = AE/AC
9/AB = 4/7
AB = 9. 7 / 4
AB = 15,75 cm