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r=1,15cm
Obw=2πr=2,3π
2*2,3π=4,6π≈4,6x3,14=14,44cm
r=1,15cm
π=3,14
l=2πr
l=2*3,14*1,15
l=6,28*1,15
l=7,222cm
2*7,222=14,444=14cm(w zaokrągleniu)