
 TangentPaper (Site not responding. Last check: 20071008) 
  If we are given an arbitrary line, l, with an arbitrary point, p, and an arbitrary circle, O, (with center k) not intersecting the line or point, then we would like to find two circles which are tangent to our given point and circle. 
  Now, if we construct a line w parallel to line l through point a, w should be the directrix and point k should be the focus for a parabola opening to the right with its vertex at point f when it is collinear with points a, p, and k. 
  Similarly, if we construct a line x parallel to line l through point b, x should be the directrix and k should be the focus for a parabola opening to the right with its vertex at point g when it is collinear with points b, p, and k. 
 jwilson.coe.uga.edu /emt669/Student.Folders/Moore.John/tangents/tangentpaper.html (464 words) 
