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d = a√2
a = d /√2
a = 5/√2
a = 5√2/2
a = 2,5√2
P = a²
P=2,5√2 * 2,5√2 = 12,5cm²
a√2 = 5 /:√2
a = 5 :√2 / usuwamy niewymierność z mianownika mnozac licznik i mianownik przez √2
a= 5*√2 ÷√2 * √2
a= 5√2 ÷ 2
a=2,5 √2
ob =4a
ob=4*2,5√2
ob = 10√2