Oblicz pola i obwody kół o średnicach: 1km ; 2,4m ; 2/7cm ; 7dm
2-kwadratpi*r2=0,25pipi*r2=1,44pipi*r2=204.49pipi*r2=12,25pi
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2-kwadrat
pi*r2=0,25pi
pi*r2=1,44pi
pi*r2=204.49pi
pi*r2=12,25pi