Volume of a right cylinder?

Looking at Google, the formula for the volume of a cylinder is $V = \pi r^2 h$

Plugging stuff in, we have $V = \pi * (15/2)^2* 8$

Solving gives us $V = 450 \pi$

or V = 450pi units^2

//edit

I should clarify that r = d/2. That's why I used 15/2.