Odpowiedź :
Ob=2x∏xr
Ob=2x∏x2cm=2x3,14x2cm=12,56cm
Ob=2x∏x4cm=2x3,14x4cm=25,12cm
Ob=2x∏x0,3cm=2x3,14x0,3cm=1,872cm
Ob=2x∏x10km=2x3,14x10km=62,8km
Ob=2x∏x2cm=2x3,14x2cm=12,56cm
Ob=2x∏x4cm=2x3,14x4cm=25,12cm
Ob=2x∏x0,3cm=2x3,14x0,3cm=1,872cm
Ob=2x∏x10km=2x3,14x10km=62,8km
Ob = 2*∏*r
Ob = 2*∏*2 cm = 2*∏*2 cm = 4∏ cm
Ob = 2*∏*4 cm = 2*∏*4 cm = 8∏ cm
Ob = 2*∏*0,3 cm = 2*∏*0,3 cm = 0,6∏ cm
Ob = 2*∏*10 km = 2*∏*10 km = 20∏ km
Ob = 2*∏*2 cm = 2*∏*2 cm = 4∏ cm
Ob = 2*∏*4 cm = 2*∏*4 cm = 8∏ cm
Ob = 2*∏*0,3 cm = 2*∏*0,3 cm = 0,6∏ cm
Ob = 2*∏*10 km = 2*∏*10 km = 20∏ km