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π - 3,14
L=π×d
d=2r
d - średnica
r - promień
Pк - pole koła
Pк=πr²
d=L÷π
d=6,28÷3,14
d=2cm
r=1cm
Pк=π1²
Pк=π1
Pк=1πcm²
Myślę, że pomogłam