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Find an equation of the circle having center (4,-3) and radius 5?
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\n" ); document.write( "Plot the point (4,-3) on an x/y coordinate system.
\n" ); document.write( "Draw a circle around it with radius approximately 5.
\n" ); document.write( "Pick any point on that circle and label it (x,y)
\n" ); document.write( "From that point draw a segment perpendicular to the line y=-3.
\n" ); document.write( "Draw a radius sement from (4,-3) to (x,y)
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\n" ); document.write( "You should see a right triangle with vertices at
\n" ); document.write( "(4,-3), (x,y) and (x,-3)
\n" ); document.write( "That right triangle has hypotenuse = 5,
\n" ); document.write( "a side of length y+3 and a side of length x-4.
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\n" ); document.write( "Using Pythagoras you have:
\n" ); document.write( "(x-4)^2 + (y--3)^2 = 5^2
\n" ); document.write( "or
\n" ); document.write( "(x-4)^2 + (y+3) ^2 = 5^2
\n" ); document.write( "That is the equation for every point on th circle.
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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