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9 : 5
9y : 5y
keliling = 2(p+l)
392 = 2(9y+5y)
392 = 2(14y)
392 = 28y
y = 392/28
y = 14
panjang = 9y = 9 x 14 = 126 m
lebar = 5y = 5 x 14 = 70 m