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Verified answer
Jawab :K = 2(p + l)
1440 = 2(7y + 5y)
1440 = 2(12y)
1440 = 24y
y = 60
P = 7 . 60 = 420 m
L = 5 . 60 = 300 m
L = p . l
= 420 . 300
= 126.000