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r=4m
Obw=2πr=2π*4=8π≈25,12m
r=0,3cm
Obw=2πr=2π*0,3=0,6π≈1,884cm
r=10km
Obw=2πr=2π*10=20π≈62,8km
2.
Ś=3m R=1,5m
Obw=2πr=2π*1,5=3π≈9,42m
Ś=0,4cm R=0,2cm
Obw=2πr=2π*0,2=0,4π≈1,256cm
Ś=200m R=100m
Obw=2πr=2π*100=200π≈628m
3.
Obw=1m
Obw=2πr
1=2πr /π
1/π=2r /2
0,5/2π=r
0,07m≈r
Obw=628mm
Obw=2πr
628=2πr /π
628/π=2r /2
628/2π=r
100mm≈r
Obw=3,5cm
Obw=2πr
3,5=2πr /π
3,5/π=2r /2
3,5/2π=r
0,55cm≈r