Hello!
Let's write some important information contained in the exercise and solve it to check the answer:
radius: 5m
height: 12m
Solving:
[tex]\begin{gathered} V=\frac{A_b\times h}{3} \\ \\ V=\frac{\pi\times r^2\times h}{3} \\ \\ V=\frac{\pi\times5^2\times12}{3} \\ \\ V=\frac{300\pi}{3} \\ \\ \boxed{V=100\pi\text{ }\mathrm{m^3}} \\ \end{gathered}[/tex]
She used the formula of the volume of the cylinder and just forgot one step: divide the result by 3.
