document.write( "Question 958882: find the largest area possible for a right triangle whose hypotenuse is 5 inches long \n" ); document.write( "
Algebra.Com's Answer #586031 by Edwin McCravy(20054)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "\"Area\"\"%22%22=%22%22\"\"expr%281%2F2%29%28base%29%28height%29\"\r\n" );
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document.write( "Let the area be y.\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"expr%281%2F2%29x%2Asqrt%2825-x%5E2%29\"\r\n" );
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document.write( "Set y' equal to 0 to find relative extrema:\r\n" );
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document.write( "Square both sides:\r\n" );
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document.write( "Multiply both sides by the denominator on the right\r\n" );
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document.write( "Take positive square roots of both sides:\r\n" );
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document.write( "\"matrix%282%2C3%2C%22%22%2C%22%22%2C%22%22%2C%0D%0A%0D%0A25-x%5E2%2C%22%22=%22%22%2Cx%5E2%29\"\r\n" );
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document.write( "\"25-x%5E2\"\"%22%22=%22%22\"\"x%5E2\"\r\n" );
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document.write( "\"25\"\"%22%22=%22%22\"\"2x%5E2\"\r\n" );
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document.write( "\"25%2F2\"\"%22%22=%22%22\"\"x%5E2\"\r\n" );
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document.write( "Take positive square roots of both sides:\r\n" );
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document.write( "\"sqrt%2825%2F2%29\"\"%22%22=%22%22\"\"x\"\r\n" );
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document.write( "\"5%2Fsqrt%282%29\"\"%22%22=%22%22\"\"x\"\r\n" );
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document.write( "Rationalize the denominator:\r\n" );
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document.write( "\"5sqrt%282%29%2F2\"\"%22%22=%22%22\"\"x\"\r\n" );
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document.write( "So the base is \"5sqrt%282%29%2F2\"\r\n" );
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document.write( "We find the height but substituting in\r\n" );
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document.write( "height = \"sqrt%2825-x%5E2%29\"\r\n" );
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document.write( "height = \"sqrt%2825-%285sqrt%282%29%2F2%29%5E2%29\"\r\n" );
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document.write( "height = \"sqrt%2825-25%2A2%2F4%29\"\r\n" );
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document.write( "height = \"sqrt%2825-25%2F2%29\"\r\n" );
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document.write( "height = \"sqrt%2825%2F2%29\"\r\n" );
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document.write( "height = \"5%2Fsqrt%282%29\"\r\n" );
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document.write( "height = \"5sqrt%282%29%2F2\"\r\n" );
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document.write( "So the dimensions of the right triangle with maximum area has\r\n" );
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document.write( "base and height both equal to  \"5sqrt%282%29%2F2\"\r\n" );
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document.write( "which is an isosceles right triangle.\r\n" );
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document.write( "Its area is found by substituting \"5sqrt%282%29%2F2\" into:\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"expr%281%2F2%29x%2Asqrt%2825-x%5E2%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"expr%281%2F2%29%285sqrt%282%29%2F2%29%2Asqrt%2825-%285sqrt%282%29%2F2%29%5E2%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285sqrt%282%29%2F4%29%2Asqrt%2825-25%2A2%2F4%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285sqrt%282%29%2F4%29%2Asqrt%2825-25%2F2%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285sqrt%282%29%2F4%29%2Asqrt%2825%2F2%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285sqrt%282%29%2F4%29%2A%285%2Fsqrt%282%29%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285cross%28sqrt%282%29%29%2F4%29%2A%285%2Fcross%28sqrt%282%29%29%29\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"%285%2F4%29%2A5\"\r\n" );
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document.write( "\"y\"\"%22%22=%22%22\"\"25%2F4\"\r\n" );
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document.write( "The maximum area is \"25%2F4\" or \"6%261%2F4\" square inches.\r\n" );
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document.write( "The triangle with maximum area looks like this:\r\n" );
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document.write( "Edwin
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