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sisi = x+2
K ≤ 20 cm
maka :
K ≤ 4 x sisi
20 ≤ 4 x (x+2)
20 ≤ 4x + 8
20-8 ≤ 4x
12 ≤ 4x
12/4 ≤ x
x ≥ 3
mk :
Lmax = sisi x sisi
= 3 x 3 = 9 cm²