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Question

The radius of the circle given by x2+y2+z2+2x2y4z19=0=x+2y+2z+7, is

A
4
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B
3
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C
2
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D
1
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Solution

The correct option is B 3
Radius of the sphere is r=12+(1)2+(2)2+19=5
And center of the sphere is C=(1,1,2)
Now distance of the given plane from the centre is CP=1+2+4+71+4+4=4
Hence radius of the circle is =r2CP2=3

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