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r=1/2 a
l=2r
r+l=3r
3r=21
r=7
l=2*7
l=14
Pb=πrl
Pb=7*14π
Pb=98π [j²]
2r=l
r+l=21
r+2r=21
3r=21
r=7
l=2*7=14
Pb=14*7π
Pb=98 π