1.
r=10cm
P=pir^2
P=10^2pi=100picm^2
r1=2cm
P1=2^2pi=4picm^2
P-P1=100pi-4pi=96picm^2 pole pierścienia
2.
r=6,3dm=63cm
P=63^2pi=3969pi cm^2
r1=4,9dm=49cm
P1=49^2pi=2401picm^2
P-P1=3969pi-2401pi=1568picm^2 pole pierścienia
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1.
r=10cm
P=pir^2
P=10^2pi=100picm^2
r1=2cm
P1=2^2pi=4picm^2
P-P1=100pi-4pi=96picm^2 pole pierścienia
2.
r=6,3dm=63cm
P=63^2pi=3969pi cm^2
r1=4,9dm=49cm
P1=49^2pi=2401picm^2
P-P1=3969pi-2401pi=1568picm^2 pole pierścienia