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h=wysokosc
v=πr²h
18√3 π=πr²h /;π
18√3=r²h
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tg30=h/R
√3/3=h/R
3h=R√3
h=R√3/3
R=2r
h=2r√3/3
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18√3=r²h
18√3=r² * 2r√3/3 /;√3
18=2r³ /3
r³=18;2/3
r³=27
r=3
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h=2r√3/3=2*3√3/3=2√3
Pb=2πrh=2π*3*2√3=12π√3j.²