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P=a²
a²=81/√
a=9 <-bok
O=4*9=36cm
p=a^2
a=9cm==> bok kwadratu
obw.= 4a
obw.= 4*9= 36cm
a=√P
a=√81 cm = 9cm
O - obwód
O=4a
O=4*9cm=36cm