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d= a√2 d = 2 dm
2dm = a√2 / : √2
a = 2dm / √2 usuwamy niewymierność z mianownika
(2dm * √2) / (√2 * √2) = 2 √2 dm / 2 = √2 dm
a = √2 dm
bok kwadratu wynosi √2 dm