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k=40
k=2(p+l)
k=2[(2l-4)+l]
40=2(3l-4)
3l-4=40/2
3l=20+4
l=24/3
l=8 cm
p=2l-4=2×8-4=16-4=12 cm
Luas=p×l=12×8=96 cm²