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a) obw = 22 pi
22 pi = 2 pi r /:pi
22=2r /:2
r = 11 <- tyle ma promień
b) obw = 19 pi
średnica koła (d)= 2 razy promień koła
d = 2r
obwód = 2 pi r
19 pi = 2 pi r /:pi
19=2r <- odpowiedź ile ma średnica