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Which of the following is the equation of a circle whose center is at the origin and whose radius is 4?

User Swasidhant
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1 Answer

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The equation of circle is
(x-a)^(2) +(y-b)^2=r^2 where (a,b) is the center of circle and r is radius of circle. In your question, (a,b)=(0,0) and r=4 so, the equation is
x^2+y^2=4^2

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