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Let C be a circle in the family of conce...

Let C be a circle in the family of concentric circles `x^(2)+y^(2)=k^(2)`,
where k is a parameter. If C passes through `(1,2)`, then the
equation of C is

A

`x^(2)+y^(2)=5`

B

`x^(2)+y^(2)=25`

C

`x^(2)+y^(2)=sqrt(5)`

D

`x^(2)+y^(2)=4`

Text Solution

Verified by Experts

The correct Answer is:
A
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