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r²=64
r=√64
r=8cm=promien
srednica= R= 2 r=2*8=16cm
obwód koła=2πr=2π*8=16πcm
πr² = 64π cm² /:π
r² = 64cm² /√
r = 8cm ---> promień
2*8cm = 16cm ----> średnica
l= 2πr
l = 16π cm ----> obwód