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l(lebar) = l
K = 54 m
K = s+s+s+s
54 = 3l + l + 3l + l
54 = 8l
l = 6,75 m
L = p x l
L = 3l x l
L = 3(6,75) x 6,75
L = 20,25 x 6,75
L = 136,6875 m persegi