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1 16π
l=16π
16π=2πr
16=2r
r=8
P=r²π=64π
2 π
l=π
π=2πr
1=2r
r=0,5
P=r²π=0,25π
3. 0,12π
l=0,12π
0,12π=2πr
0,12=2r
r=0,006
P=0,0036π
4. 2/3π
l=2/3π
2/3π=2πr
2/3=2r
5. 4π
l=4π
4π=2πr
4=2r
r=2
P=r²π=4π