Circle and line Intersectionhttp://www.blogger.com/img/blank.gif

Let us learn about circle and line intersection,
So, let us consider a circle and a line PQ. There can be three possibilities given
in Fig. below:
In Fig. (i), the line PQ and the circle have no common point. In this case,
PQ is called a non-intersecting line with respect to the circle. In Fig.(ii), there
are two common points A and B that the line PQ and the circle have. In this case, we
call the line PQ a secant of the circle. In Fig.(iii), there is only one point A which
is common to the line PQ and the circle. In this case, the line is called a tangent to the
circle.