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ef=...(4,8)
cf 6
__=__
cb 10
ef x
___=__
ab 8
6 x
__=__
10 8
10x=48
x=4,8
b.
ab=c (10,5)
4 6
__=__
7 x
4x=42
x=10,5
8 / EF = 10 / 6
48 = 10 EF
EF = 48 / 10 = 4,8 cm
B) AB / EF = BC / CF
AB / 6 = 7 / 4
4 AB = 42
AB = 42 / 4 = 10,5 cm