Multiple Choice Questions on Find the centre and radius of a circle 4x sup2 4y sup2 8x y 1 0 ........ for CDS Exam Preparation

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Multiple Choice Questions

Find the centre and radius of a circle 4x sup2 4y sup2 8x y 1 0 ........

Quantitative Aptitude (CDS) Coordinate Geometry
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    Find the centre and radius of a circle 4x²+4y²-8x+y-1=0 .

    centre (1,-1/8) radius = 9/8

    Correct Answer

    centre (1/8,1)  radius = 9/8

    Incorrect Answer

    centre (-1,1/8) radius = 9/8

    Incorrect Answer

    centre (1,-1/8) radius = 8/9

    Incorrect Answer
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    Explanation:

    equation x²+y²-2gx-2fy-c=0 represent a circle then 
    centre (g, f) & radius = √((g^2 )+f^2+c) 
    putting values of g,f,c we get centre (1,-1/8) radius = 9/8

    By: bhavesh kumar singh
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