- If you have a surface
*x(u,v)* and you hold *u*
constant, then
* x*(constant,*v*) will be a
- surface and I have a good reason why
- surface but I am unsure of why
- curve but I am unsure of why
- curve and I have a good reason why
- no way to tell without more info about
*x(u,v)*

- On a round torus, sitting on a table, the following are geodesics:

- all vertical circles on the donut
- all horizonal circles on the donut
- both of the above
- none of the above

- On a FLAT torus in
*R*^{4} the following are geodesics:

- the curves corresponding to vertical lines from the covering
- the curves corresponding to horizontal lines from the covering
- both of the above
- none of the above