A straight line touches the circumference of a circle only at one point and it is a tangent line
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You need some more information about any of the circles, or about the relationship between the two circles, to answer this question.
... touches each circle in exactly one point on each circle. given any two circles where none is entirely inside or inside and tangent to the other, there are at most four straight lines that are tangent to both circles.
If two lines cross they share a point of intersection. For two straight lines this is limited to one common point, for two circles two points and for complex lines like two sine waves the number of common points has no limit.
In general, there is no relationship between the two.
Tangential circles.