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30 = 2LM + LM + 2LM
30 = (2+1+2)LM
30 = 5LM
LM = 30/5
LM = 6 ------> jadi, KM = KL = 2LM = 2.6 = 12cm (C)
keliling = KL + KM + LM
30 = 2 LM + 2 LM + LM
30 = 5 LM
LM = 6 cm
KM = 2 x LM
= 2 x 6
= 12 (C)