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12cm:4 = 3cm (bok kwadratu)
P=3cm * 3cm = 9cm²
4a=12
a=3cm
P=a*a
P=9cm kw
3*3=9wzór na pole kwadratu to a*a czyli 3*3=9
odp;obwód kwadratu wynosi 9cm kwadratowych