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s² = 144 cm²
s = √144 cm²
s = 12 cm
diagonal = s√2 = 12√2 cm
diagonal (d) = ?
L = 1/2 x (d) kuadrat
144 = 1/2 x (d) kuadrat
288 = (d) kuadrat
√288 = d
d = 16,9