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pole 1 podstawy=18π:2=9π
πr²=9π/:π
r²=9
r=3cm
2πrh=60π/;π
2×3h=60
h=60:6
h=10cm
v=9πh=9π×10=90πcm³
Licze na najlepsze:).
Pb=60π
2πrh=60π
Pc=2πr^2+Pb
Pc=2πr^2+2πrh
Pc=78π
2πr^2+60π=78π tego masz
r^2=9
r>0
r=3
2πrh=60π
3h=30
h=10
V=πr^2*h
V=90π
Powinno być dobrze:D