# Homework Help: Meridians and Circles of Latitude of a surface of revolution

1. Feb 19, 2014

### Zaculus

1. The problem statement, all variables and given/known data
Find the meridians and circles of latitude of a surface of revolution $X(t, \theta) = (r(t)cos(\theta), r(t)sin(\theta), z(t))$.

2. Relevant equations

3. The attempt at a solution
I honestly just need a definition of what these concepts are. My book, as an aside for this specific homework problem, just says they are the $t$-curves and $\theta$-curves respectively. Does this mean I fix $\theta$ and see what the image of $X$ is, and then vice-versa for $t$?

2. Feb 19, 2014

### LCKurtz

Yes. Some texts call them parameter curves.