document.write( "Question 1027860: Please, help me with this
\n" ); document.write( "Suppose the radius of a circle is 3cm at a certain instant and it is increasing at the rate of 0.5cm/sec, at what rate will the area be increasing at the instant?
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Algebra.Com's Answer #643082 by robertb(5830)\"\" \"About 
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\"A+=+pi%2Ar%5E2\" ==> \"dA%2Fdt+=+2%2Api%2Ar%2A%28dr%2Fdt%29\"\r
\n" ); document.write( "\n" ); document.write( "==> \"dA%2Fdt+=+2%2Api%2A3%2A0.5+=+3pi\" sq.cm/sec.
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