1. The problem statement, all variables and given/known data http://img11.imageshack.us/img11/6340/conicshyperbola1.jpg [Broken] 2. Relevant equations [tex]d^2=(x_2-x_1)^2+(y_2-y_1)^2[/tex] [tex]y-y_1=m(x-x_1)[/tex] [tex]m_1m_2=-1[/tex] 3. The attempt at a solution I was able to answer (i) but for (ii) I would go about it like this: Find the equation of the line SR by using that it is perpendicular to the line l and passing through the focus S(ae,0). Then solve both equations simultaneously to find the point of intersection at R(x,y). Then find the distance between S and R given that I know both coordinates. But looking at the marking criteria, it is only worth 1 mark and thus must have a much simpler way of being solved. Any ideas?