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keliling = 2(p+l)
1440 = 2(7x + 5x)
1440 = 2(12x)
1440 = 24x
x = 60
luas kebun = pxl
= 7x X 5x
= 7x60 X 5x60
= 420 x 300
= 126.000 m²
Panjang = 7/12 x 720 = 420 m
Lebar = 5/12 x 720 = 300 m
Luas = p x l
= 420 x 300
= 126.000 m²