the circle whose eq. are x2 +y2 +c2=2ax and x2 +y2 +c2-2by=0 will touch another externally if
a. 1/b2 +1/c2 =1/a2
b. 1/b2 =1/c2 +1/a2
c. 1/a2 +1/b2 =1/c2


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### Answers : (3)

                                        Answer is c)

3 years ago
                                        HOW?

3 years ago
                                        is it right or not?

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