Jawabanmu

2014-06-01T14:46:49+07:00
3/12 x 120
= 1 /4 x 120
= 30 cm
2014-06-01T14:50:45+07:00
Kll = KL + LM + KM
120 = 5x + 4x + 3x
120 = 12 x
x = 10

panjang KM = 3x = 3(10) = 30 cm