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l = 11 cm
2πr = 11 / : 2
πr = 5,5 / : π π ≈ 3,14
r ≈ 1,75
średnica: 1,75 * 2 ≈ 3,5
11=2pi r
11=2*3.14 r
11/6.24=1.76 w przyblizeni
srednica=2*1.76 w przyblizeniu=3.52
odp.srednica w przyblizeniu wynosi3.52