Question: Find the volume of the solid generated by revolving the triangular region enclosed by $y = |x|$ and $y = 1$ about the line $x = −2$.
$$\pi*9*1 - \pi*1*1 - 1/3 *\pi* 1 - 1/3 *\pi* 1 = 22/3 \pi$$
Use the large cylinder minus the small cylinder and minus two cones.
But the correct answer is 4pi
Did I do anything wrong?