Find the number of common tangents, if r1 + r2 = C1C2 .(With usual notations, r1 & r2 and C1 & C2 are the radii and centres of the two circles.)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 3.
As given in the figure, if r1 + r2 = C1C2
the two circles touch each other only at one point.
Hence, we can see from the figure that there are 3 common tangents.