The number of direct common tangents to two intersecting circles is `"_______"`

Common tangent to two circles

Fill in the blanks Maximum number of common tangent of two intersecting circles is______.

Number of common tangents of two concentric circle are

What can be the maximum number of common tangent which can be drawn to two non-intersecting circles?

PP' and QQ' are two direct common tangents at two circles intersecing in point A and B .The common chord produced intersects PP' in R and QQ' in S.prove that RS^(2)=PP^(2)+AB^(2)

The minimum number of common tangents drawn to two circles when both circles touch each other externally is___