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l : 2x
L: 150 cm²
jawab: L = P X L
150 CM² = 3x X 2x
150 CM² = 6x²
x² = 150/6
x²= 25
x=√25
x=5
P = 3x
=3.5=15 cm
L = 2x
=2.5=10cm
K=2(p+l)
=2(15+10)
=2(25)
= 50 cm