document.write( "Question 1174553: Find the equation of a circle that has a diameter with the endpoints given by the points A (-5,4) and (7,9) \n" ); document.write( "
Algebra.Com's Answer #799973 by MathLover1(20850)\"\" \"About 
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Find the equation of a circle that has a diameter with the endpoints given by the points A (\"-5\",\"4\") and (\"7\",\"9\")\r
\n" ); document.write( "\n" ); document.write( "the length of a diameter is equal to distance between given points:\r
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Solved by pluggable solver: Distance Between 2 points
The distance formula is \"sqrt%28%28%28x%5B2%5D-x%5B1%5D%29%5E2%29%2B%28%28y%5B2%5D-y%5B1%5D%29%5E2%29%29\". Plug in the numbers,\r
\n" ); document.write( "\n" ); document.write( "\"sqrt%28%28%287-%28-5%29%29%5E2%29%2B%28%289-%284%29%29%5E2%29%29\" \r
\n" ); document.write( "\n" ); document.write( "\"sqrt%2812%5E2%2B5%5E2%29\" The distance is 13.\r
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\n" ); document.write( "\n" ); document.write( "\"d=13\" => radius is \"r=13%2F2\"\r
\n" ); document.write( "\n" ); document.write( "the center of a circle is half way between given points\r
\n" ); document.write( "\n" ); document.write( "C (\"%28-5%2B7%29%2F2\",\"%284%2B9%29%2F2\")
\n" ); document.write( "C (\"1\",\"13%2F2\") => \"h=1\" and \"k=13%2F2\"\r
\n" ); document.write( "\n" ); document.write( "the equation of a circle is:\r
\n" ); document.write( "\n" ); document.write( "\"%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"%28x-1%29%5E2%2B%28y-13%2F2%29%5E2=%2813%2F2%29%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+-+2+x+%2B+1%2By%5E2+-+13+y+%2B+169%2F4=169%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+-+2+x+%2B+1%2By%5E2+-+13+y+%2B+169%2F4-169%2F4=0\"\r
\n" ); document.write( "\n" ); document.write( "\"x%5E2+-+2+x+%2B+y%5E2+-+13+y+%2B+1+=+0\"\r
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