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2πr= 25cm
π≈3,14
2*3,14r=25cm
6,28r=25cm/6,28
r≈ 3,96cm
2 Okrąg:
2πr= 20,25cm
π≈3,14
2*3,14r=20,25cm
6,28r=20,25cm/6,28
r≈ 3,22cm
Róznica: 3,96-3,22= 0,74cm