document.write( "Question 1061957: A square of side length S and an equilateral triangle of side length S are placed inside a rectangle of
\n" ); document.write( "length 2S and width S as shown. What fraction of the area of the rectangle remains uncovered?\r
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Algebra.Com's Answer #676728 by josgarithmetic(39620)\"\" \"About 
You can put this solution on YOUR website!
How high is the equilateral triangle?
\n" ); document.write( "Base is S and the length of the other two of its sides also S each. Pythagorean Theorem formula will help; imagine cutting the triangle into two parts along the altitude.\r
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\n" ); document.write( "\n" ); document.write( "\"S%5E2=%28%281%2F2%29S%29%5E2%2Ba%5E2\", using \"a\" for the altitude length.
\n" ); document.write( "\"a%5E2=S%5E2-S%5E2%2F4\"
\n" ); document.write( "\"a%5E2=4S%5E2%2F4-S%5E2%2F4\"
\n" ); document.write( "\"a%5E2=3S%5E2%2F4\"
\n" ); document.write( "\"highlight_green%28a=S%2Asqrt%283%29%2F2%29\"\r
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\n" ); document.write( "\n" ); document.write( "Area of the whole rectangle:
\n" ); document.write( "\"S%2A2S\"
\n" ); document.write( "\"highlight%282S%5E2%29\"\r
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\n" ); document.write( "\n" ); document.write( "Fraction of the area which is uncovered:
\n" ); document.write( "\"%28totalArea-coveredArea%29%2FtotalArea\"
\n" ); document.write( "-
\n" ); document.write( "\"%282S%5E2-%28S%5E2%2B%281%2F2%29S%2Aa%29%29%2F%282S%5E2%29\"\r
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\n" ); document.write( "\n" ); document.write( "Substitute for a:\r
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\n" ); document.write( "\n" ); document.write( "\"%282S%5E2-%28S%5E2%2B%281%2F2%29S%28S%2F2%29sqrt%283%29%29%29%2F%282S%5E2%29\"\r
\n" ); document.write( "\n" ); document.write( "The simplification algebra steps are not shown here, but final result should be \"highlight%28%284-sqrt%283%29%29%2F8%29\".
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