1. The problem statement, all variables and given/known data Given two lines, in 3D, connected end to end with lengths L0 and L1, a point P0 where the first line starts, and a point P1 where you want the end of the second line to be at. Find the configurations of the lines that put the end of the second line at P1. You can restrict the degree of freedom on the lines. 2. Relevant equations 3. The attempt at a solution I can easily connect 2 end-points together, but it seems like there's more to this question than that. The "find the configurations" part indicates there's many solutions? And not sure about the "restrict the degree of freedom". Pointers anyone? Much appreciated! EDIT: Removed doubled headings.