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panjang = 7x
lebar = 5x
Keliling = 1440m
2(p+l) = 1440 m
2(7x+5x)= 1440
2.12 x = 1440
24x= 1440
x=60
panjang = 7x = 7.60 = 420
lebar = 5x = 5.60 = 300
Luas = p x l = 420 x 300 = 126000