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1440 = 2 x (p + l)
1440/2 = p + l
720 = p + l
cara mencari sisi2 nya adalah dgn perbandingan tsb
panjang = 7 : 12 x 720 ----> 12 adalah jumlah perbandingan tsb
= 7 x 60
= 420 m
lebar = 5 : 12 x 720
= 5 x 60
= 300 m
Luas = p x l
= 420 x 300
= 126.000 m^2