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Question

The radius of the circle, x2+y22x+4y11=0 is .

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is D 4

The radius of the circle x2+y2+2gx+2fy+c=0 is g2+f2c

The equation of the circle given is x2+y22x+4y11=0

g=1, f=2 and c=11

Radius, r=(1)2+(2)2(11)

=1+4+11

=16=4


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