The volume formula of a cone is
![\frac{1}{3} \pi r^{2} h](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B3%7D%20%20%5Cpi%20%20r%5E%7B2%7D%20h)
the r is the radius and h is the height. However, if you multiply by pi, you will get an approximated volume of the cone. So we will multiply like this for now.
![\frac{1}{3} r^{2} h](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B3%7D%20%20r%5E%7B2%7D%20h)
Don't worry, we'll use pi in the end.
I'm going to assume that 7 inches is your radius. We need to plug in 7 for r and 4 in for h into the equation. Once we do that, it will look like this.
![\frac{1}{3} 7^{2} 4](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B3%7D%20%207%5E%7B2%7D%204)
![\frac{1}{3}](https://tex.z-dn.net/?f=%20%5Cfrac%7B1%7D%7B3%7D%20)
means we will need to divide one by 3. That gives us 0.33333... now we have to multiply by
![7^{2}](https://tex.z-dn.net/?f=%207%5E%7B2%7D%20)
we get 16.33333... now the last thing we need to do is multiply by 4, which is h. We get 65.33333. Add pi and you have your answer.