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P=πr²
r²=P/π
π≈3,14
r²=10 000 000/3,14=3 184 713 m²
r=√3184713
r≈1784,58 m dlugość promienia
1000ha = 10000000m2
P=πr^2
10000000=πr^2 /π
3184713=r^2 / przez pierwiastek
π~~3,14
r~~ 1785[m]