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z tego obliczysz bok kwadratu
a√2=√6
a=√12:2=√3
pole kwadratu=a²=(√3)²=3j.²
obwód=4a=4×√3=4√3j.
pole obliczysz też bez szukania boku
p=½d²=½×(√6)²=½×6=3j.²