The two circles : x^2+y^2 =ax and x^2+y^...

The two circles : `x^2+y^2 =ax` and `x^2+y^2=c^2` (c > 0) touch each other if :

A

|a|=c

B

a=2c

C

|a|=2c

D

2|a|=c

Verified by Experts

The correct Answer is:

A

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