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The area of a circle is . What is the circumference?

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The ACT Mathematics Test contains 60 questions to be answered in 60 minutes.  The hardest ACT math questions (the last 10 to 15 questions) fall into two types: advanced concepts and complex questions. Advanced concepts questions cover what you learn in precalculus and trigonometry. FYI: Students that get into Harvard College have an ACT score of 34–36.

The area of a circle is <img alt='images' src='https://www.fatskills.com/images2/ACT/eq02728.png'/><!--<m:math display='inline' overflow='scroll' xmlns:m='http://www.w3.org/1998/Math/MathML'><m:mrow><m:mn>144</m:mn><m:mi>π</m:mi></m:mrow></m:math>-->. What is the circumference?






 
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