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r=Obwód/2π
a) π
Ob=π
r=π/2π
r=1/2
b) 2
Ob=2
r=2/2π
r=π
c) 10π
Ob=10π
r=10π/2π
r=5
d) 0,6π
Ob=0,6π
r=0,6π/2π
r=0,3
e) 6,28 π
Ob=6,28π
r=6,28π/2π
r=3,14