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lebar = 5x
keliling = 2(p+l)
1440 = 2(7x+5x)
1440 = 2(12x)
1440 = 24x
x = 1440/24
x = 60
panjang = 7x = 7 x 60 = 420 m
lebar = 5x = 5 x 60 = 300 m
luas = p x l
luas = 420 m x 300 m
luas = 126.000 m²
panjang= x 720 = 420m
lebar = x 720 = 300m
luas = pxl
= 420m x 300m = 126000 m2