document.write( "Question 1141838: A piece of wire 20 m long is cut into two pieces. One piece is bent into a square and the other is bent into a circle.\r
\n" ); document.write( "\n" ); document.write( "(a) How much of the wire should go to the square to maximize the total area enclosed by both figures? \r
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\n" ); document.write( "\n" ); document.write( "(b) How much of the wire should go to the square to minimize the total area enclosed by both figures?
\n" ); document.write( "I got 11.201m for this
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Algebra.Com's Answer #762488 by josgarithmetic(39621)\"\" \"About 
You can put this solution on YOUR website!
A way to start is like this:
\n" ); document.write( "x, the amount to make the square
\n" ); document.write( "20-x, the amount to make the circle.\r
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\n" ); document.write( "\n" ); document.write( "Area of Square: \"%28x%2F4%29%5E2=x%5E2%2F16\"\r
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\n" ); document.write( "\n" ); document.write( "Area of Circle: circumference with radius r, \"2pi%2Ar=20-x%7D%7D%0D%0Ameaning+%7B%7B%7Br=%2820-x%29%2F%282pi%29\"
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\n" ); document.write( "Area of this part, \"%2820-x%29%5E2%2F%284pi%29\"\r
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\n" ); document.write( "\n" ); document.write( "A, the total area of combined square and circle:
\n" ); document.write( "\"highlight_green%28A=x%5E2%2F16%2B%2820-x%29%5E2%2F%284pi%29%29\"
\n" ); document.write( "This function is what you want to find the minimum for. \r
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\n" ); document.write( "\n" ); document.write( "The differentiation and algebraic steps should give
\n" ); document.write( "\"highlight_green%28dA%2Fdx=%28%288%2Bpi%29x-160%29%2F%288pi%29=0%29\"
\n" ); document.write( "and solving for x should be no trouble.
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