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L=2*Pi*r= 2*Pi*0,5*d
L= 2*3,14*0,4m=6,28*0,4=2,512 m
Odległość =ilość obrotów razy obwód
s=n*L
s=7000*2,512=17584m= 17,584km ;)
r - promień koła
d - średnica koła = 80 cm
πd = 80π = 251,2 cm
251,2 cm razy 7000 = 1758400 cm = 17584 m = 17,584 km