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2pi * r = 4m
6.28 * r = 4m |/6.28
r = 4m/6.28
r = 0.637m
Odpowiedź: Promień tego koła jest równy 0.637m.
2πr = 4m
r = 4/2π = 2/π = 2m/3,1416 = ok 0,64m