Multiple Choice Questions on A circle having centre origin and radius r will be ........ for CDS Exam Preparation

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Multiple Choice Questions

A circle having centre origin and radius r will be ........

Quantitative Aptitude (CDS) Coordinate Geometry
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    A circle having centre origin and radius r will be .

    x²+y² + r² = 0

    Incorrect Answer

    x²+y² - r²  = 1

    Incorrect Answer

    x²+y² + r² = 1

    Incorrect Answer

    x²+y² = r² 

    Correct Answer
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    Explanation:

    equation of the circle having centre ( h,k ) & radius r is given by 
    (x-h)²+(y-k)²=r²
    Origin (0,0)
    So equation of the circle x²+y² = r²       

    By: bhavesh kumar singh
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