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½l=20000 km
l=2πr /:2π π≈3.14
r= l : 2π
r=20000 : 6.28
r≈6369.426 km
π≈3.141
r=20000 : 3.141
r≈6367.399km
π ≈ 3,1416
r=20000 : 3,1416
r≈6366.183 km
pozdrawiam Pepo ;]