1. The problem statement, all variables and given/known data If I have been given a surface x = 12 − y^2 − z^2 between x = 3 and x = 8, oriented by the unit normal which points away from the x–axis. I want to find an orientation preserving parameterization. 2. Relevant equations 3. The attempt at a solution I know orientation preserving means that the normal vector is pointing outward. I'm not sure how to apply this to parameterize this surface however.