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h=2r
V=54π
ze wzoru na V=πr²*h
54π=πr²*2r
54π=π2r³ /:2π
27=r³
r=3
h=2r
h=2*3
h=6
liczymy pole walca ze wzoru:
Pc=2*Pp+Pb
Pp=πr²
Pp=π*3²
Pp=9π
Pb=2πrh
Pb=2π*3*6
Pb=36π
Pc=2*9π+36π
Pc=18π+36π
Pc=54π