document.write( "Question 661955: a square and a rectangle have the equal ares. The rectangle is 20cm by 5cm. What is the perimeter of the square? \n" ); document.write( "

Algebra.Com's Answer #411897 by KMST(5328) $\"\"$ $\"About$

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The area of the rectangle is
\n" ); document.write( " $\"%2820cm%29%285cm%29=100cm%5E2\"$ .
\n" ); document.write( "If the side of the square is $\"x\"$ cm long, its area, in $\"cm%5E2\"$ is
\n" ); document.write( " $\"x%5E2\"$ .
\n" ); document.write( "If the area of the square and the rectangle are equal,
\n" ); document.write( " $\"x%5E2=100\"$ --> $\"x=10\"$ because $\"10%5E2=100\"$ <---> $\"sqrt%28100%29=10\"$
\n" ); document.write( "So the side of the square is $\"10cm\"$ long.
\n" ); document.write( "The perimeter of the square is four times the length of the side, so it is
\n" ); document.write( " $\"4%2A%2810cm%29=highlight%2840cm%29\"$ \n" ); document.write( "

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