I am currently trying to solve this problem:
The area bounded between $y = x^2$ and $y = 4$ is rotated about the $y$-axis to form a solid. Find the volume generated.
So far, I have only learnt the $\int \pi x^2 dy$ for calculating a solid that is rotated around the y-axis. However, I am having trouble solving this question.
Can someone please help and guide me through on how to solve this problem? Thanks in advance.