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l =2πr
l1=2*3.14*1000
l1=6280 m
l2=2*3.14*(1000-3)
l2=6261,16 m
6280-6261,16=18,84 m
... jest równa 18,84 m
2. l=15π
l=2πr
15π=2πr /π
15=2r /2
r=7.5