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r=9
l=2πr = 18π ≈ 56,5
Ela .
r=4
l=2πr = 8π ≈ 25
Asia .
r=12
l=2πr= 24π ≈ 75,3
Kuba .
r=1
l=2πr = 2π ≈ 6,2
Moim zdaniem odpowiedź B. czyli Ela .