$\"\"$

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Given the center (C) = (h,k) = $\"\"$ and $\"\"$ .

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$\"\"$ (Equation of a circle)

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$\"\"$ (Substitute $\"\"$ , $\"\"$ and $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Evaluate powers) $\"\"$

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The Equation of a circle is $\"\"$ .