Answer:
The height of the cylinder is 4x units.
Explanation:
volume of a cylinder = nr^2h 
n = 22/7 
r = radius = x/2 
Let illustrate with an example. If the diameter of a cylinder is 6 and the volume is 6^3 = 216. The radius = 6/2 = 3 
n3^2 x h = 216
h = 216/9 = 24
so the height is 4 times the diameter
Area of the base = nr^2
1/2^2 x x = 1/4 pi x^2