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3 : 2
anggap p=3x, l=2x
k=40cm
k=2p+2l
40=2(3x) +2(2x)
40=6x+4x
40=10x
x=40:10
x=4
P=3x
p=3.4
p=12
l=2x
l=2.4
l=8
Luas=p×l
luas=12×8
luas=96 cm²