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The equation x^(2) + y^(2) + 2gx + 2 fy ...

The equation `x^(2) + y^(2) + 2gx + 2 fy + c = 0` represents a circle of non-zero radius if

A

`g^(2) + f^(2) gt c`

B

`g^(2) + f^(2) lt c`

C

`g^(2) gt f^(2) + c `

D

`g^(2) lt f^(2) + c`

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The correct Answer is:
A
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