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Obw=40 000km
Obw=2*π*R
R=Obw/2*π
R=40 000/(2*3,14)
R=6 369 km
r=21,5 m
P=pi*r kwadrat
P=pi*462,25
P=462,25 pi m kwadrat.
3.
2 pi r=40000/2 pi
r=40000/2pi
r=20000/pi
pi=(w przyblizeniu) 3,14
r=20000/3,14=6369,43