document.write( "Question 222182: write the equation of the circle in radius-center form with the center at (2,1) and tangent to the line x=5. \n" ); document.write( "

Algebra.Com's Answer #166485 by Edwin McCravy(20060) $\"\"$ $\"About$

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write the equation of the circle in radius-center form with the center at (2,1) and tangent to the line x=5.
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document.write( "The equation of a circle in radius-center form is\r\n" );
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document.write( "where the center is the point  and\r\n" );
document.write( "the radius is .\r\n" );
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document.write( "So the equation, all but r, is:\r\n" );
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document.write( "So to find the radius  let's plot the center\r\n" );
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document.write( "Now let's draw the line , which is a vertical\r\n" );
document.write( "line through 5 on the x-axis:\r\n" );
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document.write( "Now let's sketch in a circle tangent to that line:\r\n" );
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document.write( "Draw a radius from the center (2,1) over to the line.\r\n" );
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document.write( "Using the x-axis as a measuring stick, you can see that\r\n" );
document.write( "that radius is 3 units long, so\r\n" );
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document.write( "and the final answer is\r\n" );
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document.write( "  or\r\n" );
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document.write( "Edwin

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