document.write( "Question 1203952: Estimate the instantaneous rate of change in the area of a circle when the radius is 3 cm. The formula for the area of a circle is A=πr^2 \n" ); document.write( "

Algebra.Com's Answer #839904 by ikleyn(52799) $\"\"$ $\"About$

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\n" ); document.write( "Estimate the instantaneous rate of change in the area of a circle
\n" ); document.write( "when the radius is 3 cm. The formula for the area of a circle is A=πr^2
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\n" ); document.write( "\n" ); document.write( "The problem is posed incorrectly.\r
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document.write( "The formula for the instantaneous rate of change the area of a circle is\r\n" );
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document.write( "     = 2πr*r'(t),\r\n" );
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document.write( "where r(t) is the current radius of the circle as a function of t. \r\n" );
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\n" ); document.write( "\n" ); document.write( "In order for the problem could be solved, the instantaneous rate r'(t) should be given
\n" ); document.write( "or should be calculated from other given data, but such data are missed in the problem.\r
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\n" ); document.write( "\n" ); document.write( "The \"solution\" by the other person is INCORRECT and is an example of incorrect teaching.\r
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\n" ); document.write( "\n" ); document.write( "For safety of your mind, simply ignore that \"solution\" as if you never seen it.\r
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