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KO = 2
X-OQ = 2
OQ = X-2
OM = 3
X+OQ =3
X+X-2=3
2X= 5
X= 2.5
KO/KL=OQ/PQ
2/10 = 0.5/EF
0.2 EF = 0.5
EF = 2.5 CM
semoga membantu ya :)