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a√2 - a = 3
a(√2 - 1) = 3
a = 3 / (√2 - 1)
usuwajac niewymiernosc a = 3√2 + 3
P = a²
wiec P = (3√2 + 3)² = 18 + 18√2 + 9 = 18√2 + 27