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KL : NM (6:3) -> (2:1)
KO : OM
LO : ON
misal KO=x dan NO=y
KL/NM = KO/OM
2/1 = x/6-x
12-2x=x
12=3x
x=4cm (KO)
KL/NM = LO/ON
2/1 = y/9-y
18-2y=y
18=3y
y=6 cm (ON)