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obw kola = πd = 6πcm
0,5πcm przez 6πcm= 1/12
l=2(pi)r
l=2(pi)3
l=6(pi)
(0.5(pi)/6(pi))*100%=8.33%
3.14:2=1.57cm
28.26cm²:1.57cm=18cm=63.7%