Question

Please help and show wprk

Answer 1

Volume of a cylinder is $\pi r^2h$, where r is the radius and h is the height.

This comes from the area of a circle being $\pi r^2$. A cylinder is the area of the base circle multiplied by its height.

Using this formula, the volume of the given cylinder is
$\pi r^2(3r) \\ = 3 \pi r^3$