Sin `x=y^2`, we have `x^2=y^4`.

Hence, the volume generated is:

`{: ("Vol",= pi int_c^d x^2 dy), (,=pi int_0^4 y^4 dy), (,=pi [(y^5)/(5)]_0^4), (,=pi[(1024)/(5)] - pi[0]), (,=(1024)/(5) pi\ text[units]^3), (,~~643.40\ text[units]^3) :}`