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skoro promien walca r=3cm to sradnica 2r=6cm
P=2r·h
48=6·h /:6
h=8 cm--->wysokosc walca
pole calkowite walca
Pc=2πr²+2πrh=2π·3²+2π·3·8=2·9π+48π=18π+48π=66π cm²