Answer:
The answer to your question is Volume = 254.34 in³
Explanation:
Data
diameter = 6 in
height = 3 radius
π = 3.14
Formula
Volume = πr²h
Process
1.- Calculate the radius
radius = diameter / 2
 = 6/2
 = 3 in
2.- Calculate the height 
 height = 3radius
 height = 3(3)
 = 9 in
3.- Calculate the volume
 Volume = (3.14)(3)²(9)
-Simplification
 Volume = (3.14)(9)(9)
-Result
 Volume = 254.34 in³