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Questions  

If g2+f2=c, then the equation 

x2+y2+2gx+2fy+c=0 will represent 

a
a circle of radius g
b
a circle of radius f
c
a circle of diameter c
d
a circle of radius 0

detailed solution

Correct option is D

The equation represents a circle of radius82+f2−b=c−c=0

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