If two circles intersect at two distinct points, there are ___ tangents that are common to both the circles.
2
0
1
Infinite
If from any point on the common chord of two intersecting circles, tangents be drawn to the circles, prove that they are equal.
Two circles touch each other externally at a point C and P is a point on the common tangent at C. If PA and PB are tangents to the two circles, prove that PA = PB.