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EF / BC = AE / AC
EF / 12 = 6 / 8
EF = 9 cm
11.
AC/ AE = AB / AF
8 / 6 = 10 / AF
maka AF = 7,5 cm
jika AC = 8 cm dan AF = 7,5 cm
maka panjang CF = AC - AF = (8 - 7,5 )cm= 0,5 cm