document.write( "Question 1173910: What is the radius of a circle with an area of 144 pi?
\n" ); document.write( "The correct answer is 12 but I want to understand step by step of the formulas of how that is the correct answer please. \n" ); document.write( "

Algebra.Com's Answer #799235 by ikleyn(52817) $\"\"$ $\"About$

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document.write( "For it, you need to know the formula for the area of a circle.\r\n" );
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document.write( "This formula is  \r\n" );
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document.write( "    the area = .\r\n" );
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document.write( "where  r  is the circle's radius.\r\n" );
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document.write( "The students learn it for the first time, probably, in their 3rd grade, and their teacher explains them \r\n" );
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document.write( "that  is the number (a constant value), for which people use an approximate value 3.14.\r\n" );
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document.write( "So, for your problem, you get this equation\r\n" );
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document.write( "     =     (*)\r\n" );
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document.write( "Next in equation (*), you divide both sides by this constant value , and you get then\r\n" );
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document.write( "     144 = .\r\n" );
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document.write( "Finally, you take the square root from both sides, and  - - - o-o-o-p (!) - - - you get\r\n" );
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document.write( "    r =  = 12.\r\n" );
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document.write( "Thus you get your final answer (!)\r\n" );
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