document.write( "Question 1093820: A window is to be constructed in the shape of an equilateral triangle on top of a rectangle. If its perimeter is to be 600 cm, what is the maximum possible area of the window? \n" ); document.write( "
Algebra.Com's Answer #708425 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
(Actually drawing the figure would help.)\r
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\n" ); document.write( "\n" ); document.write( "Take 2x as rectangle length and y as height of just the rectangle.
\n" ); document.write( "Each side of the triangle is also 2x (only two of them being sides for the window).\r
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\n" ); document.write( "\n" ); document.write( "Perimeter, \"600=6x%2B2y\"
\n" ); document.write( "\"y=300-3x\"
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\n" ); document.write( "Total area, \"2xy%2Bx%5E2%2Asqrt%283%29\",...adjusted...
\n" ); document.write( "Total area, \"A=2x%28300-3x%29%2Bsqrt%283%29x%5E2\", a quadratic function A
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\n" ); document.write( "\n" ); document.write( "\"A=sqrt%283%29x%5E2%2B2x%28300-3x%29\"
\n" ); document.write( "\"A=sqrt%283%29x%5E2%2B600x-6x%5E2\"
\n" ); document.write( "\"A=%28sqrt%283%29-6%29x%5E2%2B600x\"
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\n" ); document.write( "Maximum area will occur for \"2%28sqrt%283%29-6%29x%2B600=0\"
\n" ); document.write( "or for
\n" ); document.write( "\"highlight_green%28%28sqrt%283%29-6%29x%2B300=0%29\"\r
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