I want to ask:

http://mathoverflow.net/questions/11239/conformal-maps-of-doubly-connected-regions-to-annuli

I am interested in explicit formulas for the radius r described in the question. For example, if I give you parameterizations for the inner curve and the outer curve of a topological annulus, I want to be able to compute the radius of the annulus r<z<1 which it is conformally equivalent to. The question already has an accepted answer. Should I ask a new question requesting an explicit formula?

I would say, you **must** explain the relation with the previous question.