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The condition that the line (x + g) cos ...

The condition that the line (x + g) cos `theta` + ( y +f ) sin `theta` = k is a tangent to `x^2+y^2 +2gx +2fy +c=0` :

A

`g^2+f^2=c^2+k`

B

`g^2+f^2=c+k`

C

`g^2+f^2=c+k^2`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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