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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
b)
1. 16π
P=16π
16π=πr²
r²=16
r²=4
l=2π*4=8π
2 4/9
P=4/9π
4/9π=πr²
r²=4/9
r²=2/3
l=2/3*2π=4/3π
3. 0.25π
P=0.25π
0.25π=πr²
r²=0,25
r²=0,5
l=2π*0,5=π
reszty nie mam
r=?
r=l/2π
r=16π /2π
r=8cm
l=π
r=?
r=l/2π
r=π /2π
r=2cm
l=0,12π cm
r=?
r=l/2π
r=0,12π /2π
r=