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Question

If g2+f2=c, then the equation x2+y2+2gx+2fy+c=0 will represent

A

A circle of radius g

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B

A circle of radius f

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C

A circle of diameter c

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D
A circle of radius 0
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Solution

The correct option is D A circle of radius 0
Radius of given circle = g2+f2c

g2+f2c (given), Radius = 0.


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