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d = √(a²+a²) = a√2
a = d/√2 = d√2/2 = 4√2/2 = 2√2 cm
4=a√2
a√2=4 /÷√2
a=4÷√2
a=4/√2
Bok kwadratu wynosi 4 prze pierwiastek z dwóch.