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lebar = y
keliling = 2(p+l)
144 m = 2(2y + y) m
144 = 2(3y) m
144 = 6y m
144 : 6 = y m
24 = y m
p = 2y = 2 x 24 = 48 m
l = y = 24 m
maka
luas = p x l
luas = 48 m x 24 m
luas = 1152 m²
luas = 1152 x 1. 000.000
luas = 1.152.000.000 mm²