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obw kola= 2pir=2pi*10=20picm
cwiartka= 20picm²:4-5picm
plus 2 promienie=2*10=20cm
obwod cwiartki kola= 20cm+5picm² <F>
2)r=6
obw=2pir=2pi*6=12picm
r=2
2pi2=4picm
r=4
2pi4=8picm
8picm²+4picm²=12picm<P>
3)r=6cm
p=pi*r(do kwadratu)
p=pi*36
p=36picm²
r=3
p=pi*r(do kwadratu)
p=pi*9
p=9picm²
36picm²:9picm²=4 <F>
4)r=6
obw= 2 pir
2*pi*6=12picm
r=3
obw= 2 pi*r
obw= 2*pi*3
obw=6picm
12picm:6picm=2 <P>