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What is the radius of a circle whose equation is ?

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What is the radius of a circle whose equation is <img alt='images' src='https://www.fatskills.com/images2/SAT/eq04103.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:msqrt><m:mrow><m:msup><m:mrow><m:mrow><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:mi>x</m:mi><m:mo>+</m:mo><m:mn>27</m:mn></m:mrow></m:mrow></m:mfenced></m:mrow></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup><m:mo>+</m:mo><m:msup><m:mrow><m:mrow><m:mfenced open='(' close=')'><m:mrow><m:mrow><m:mi>y</m:mi><m:mo>-</m:mo><m:mn>15</m:mn></m:mrow></m:mrow></m:mfenced></m:mrow></m:mrow><m:mrow><m:mn>2</m:mn></m:mrow></m:msup></m:mrow></m:msqrt><m:mo>=</m:mo><m:mn>9</m:mn></m:mrow></m:math>-->?






 
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