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a)obw=10π
10π=2πr/:2π
r=5
b)obw=24π
24π=2πr/:2π
r=12
c)obw=0,8π
0,8π=2πr/:2π
r=0,4
zad7
a)obw=20m
20m=2πr
r=10/π przyjmujemy że π=3,14
r≈3,18m
b)obw=5 km
5km=2πr/:2π
r=2,5km/π
r≈0,8km=800m