1. The problem statement, all variables and given/known data How to find the equation of cylinder: [itex]x^2+y^2=4[/itex] from z=0 to z=2? 2. Relevant equations [tex](x-a)^2+(y-b)^2=r^2[/tex] 3. The attempt at a solution I can't figure out how to implement the z-coordinate into the general equation of cylinder. In the latter, the height is taken as infinite in both opposite directions (upward and downward).