document.write( "Question 206139: Given the circumference of a circle to be 4 Pie inches, find the area. \n" ); document.write( "

Algebra.Com's Answer #155695 by Marth(57) $\"\"$ $\"About$

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For any circle, $\"C=2pir\"$ and $\"A=pir%5E2\"$
\n" ); document.write( "Solve for r to eliminate it:
\n" ); document.write( " $\"C=2pir\"$
\n" ); document.write( " $\"C%2F%282pi%29=r\"$
\n" ); document.write( "

\n" ); document.write( " $\"A=pir%5E2\"$
\n" ); document.write( " $\"sqrt%28A%2Fpi%29=r\"$
\n" ); document.write( "

\n" ); document.write( "So $\"C%2F%282pi%29=sqrt%28A%2Fpi%29\"$
\n" ); document.write( " $\"%28C%2F%282pi%29%29%5E2%2Api=A\"$
\n" ); document.write( "Given the circumference is $\"4pi\"$ , we can now find area.
\n" ); document.write( " $\"%284pi%2F%282pi%29%29%5E2%2Api=A\"$
\n" ); document.write( " $\"A+=+2%5E2%2Api\"$
\n" ); document.write( " $\"A=4pi\"$ \n" ); document.write( "

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