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= 1.000 m
K = π × d
1.000 = 3,14 × d
1.000 : 3,14 = d
318,47 = d
r = d : 2
= 318,47 : 2
= 159,235 m
K = 1km
maka :
K = 2 x π x r
1 = 2 x 3.14 r
r = 1/6,280
r = 0,159 km
r = 15.923 cm