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Pc=2Pp+Pb=2pi r(r+h)
v=pi r^2h
czyli podstawiamy do ostatniego wzoru
108pi=pi r^2*12 | skracamy pi :12
r^2=9
r=3
Pc=2pi*3(3+12)
Pc=pi*6(3+12)
Pc= 90picm^2