If two circles intersect at two distinct points , then the number of common tangents is __________.

If two circles intersect each other, then the number of their common tangents will be

If two circles touch each otner externally, then the number of transverse common tangents is __________.

If two circle do not intersect or touch each other, then the maximum number of common tangents can be drawn is

If two circles do not intersect or touch each other, then the maximum number of common tangents can be drawn is "_________"

If two circle touch externally, then the number of their common tangents will be

Two circles intersect each other. Then the total number of common tangents that can be drawn to them is :

If two circles intersect at two points, then prove that their centres lie on the perpendicular bisector of the common chord.