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Equation of Circle with (h,k) as Center

Find the equa...

Question

Find the equation of circle with centre at $(0, 0)$ & radius $r$ .

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Solution

Given the centre of the circle is $(0, 0)$ and the radius is $r$ .
Then the equation of the circle is $(x - 0)^{2} + (y - 0)^{2} = r^{2}$ or $x^{2} + y^{2} = r^{2}$ .

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