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r=8,5
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πd=21π /:π
d=21
r = 17 : 2
r = 8,5
promień koła o obwodzie 17 pi jest równy 8.5
21 pi = 2 * pi * r
r = 21 : 2
r = 10,5 - promień
średnica= 2 * promień = 2*10,5= 21