Hello there!
Volume formula for cone: V=1/3(π)(b)(h)
First: you need to find the radius, we know that radius is half the diameter. The diameter is 12, so the radius is 6.
Second: Now we substitute b for 6 and h for 12, since the height is 12. We will substitute π for 3.14.
Third: V=1/3(3.14)(6)(12). When you simplify: 1/3x3.14x6x12=452.16
Final answer=452.16in³
I hope this helps! :)