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r=6cm=½d kwadratu
½a√2=6
a√2=6×2
a√2=12
a=12√2:2
a=6√2cm= bok kwadratu
2]
r=2cm=a szesciokata
a=2cm
pole 6-kąta=6a²√3:4=6×2²√3:4=6√3cm²