You can find the volume of a solid of revolution the same way you calculate integrals in GeoGebra .
GeoGebra Instruction 1
CAS under View in Menu. Integral(<Function>, <Start x-Value>, <End x-Value>)
in CAS. For <Function>, fill in
pi <your expression>^2
For <Start x-Value> and <End x-Value>, type in the limits of integration. Press Enter.