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2(12+l) = 40
24+2l = 40
2l = 16
l = 8
luas = p x l
= 12x8
= 96 cm²
40 = 2(12+l)
40/20= 12+l
20=12+l
20-12=l
8=l
jadi lebar persegi panjang adalah 8
luas persegi panjang adalah p×l
12×8=96