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Odp. D
r = 30cm
2π30cm ≈ 6,28 * 30cm ≈ 188,4cm ≈ 1,884 m
1km = 1000m
1000m/1,884m ≈ 530,79
Odp: C.
l = dπ
l = 60π
l = 60 * 3,14
l = 188,4 cm
1 km = 100000cm
100000/188,4 = 530,7855626327 = ( w przybliżeniu ) 530
odp. C