Question

If two circles touch each other externally, then the total number of their common tangent(s) is/are

• A.
  3
• B.
  1
• C.
  4
• D.
  2

Answer 1

The correct option is A

3
Let the two circles with centres say, $C_{1}and{C}_2$touch each other externally at P.
Clearly, the number of common tangent is 3 i.e. AB, MN and RS.

Hence, the correct answer is option a .