document.write( "Question 143411: 1. Janifryda is playing with a frisbee whose diameter is 12 inchers. If she tosses it onto a coordinate plane, and its center falls on thepoint (-2,1), whatis the equation of the frisbee?\r
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Algebra.Com's Answer #104366 by Earlsdon(6294) $\"\"$ $\"About$

You can put this solution on YOUR website!
Starting with the general form of the equation of a circle (assuming the Frisby is circular) of radius r and center at (h, k):
\n" ); document.write( " $\"%28x-h%29%5E2%2B%28y-k%29%5E2+=+r%5E2\"$
\n" ); document.write( "In the problem, the center is given as (-2, 1) and the radius is half the diameter so that's 12/2 = 6 inches. Make the appropriate substitutions into the equation:
\n" ); document.write( " $\"%28x-%28-2%29%29%5E2%2B%28y-1%29%5E2+=+6%5E2\"$ Simplify.
\n" ); document.write( " $\"%28x%2B2%29%5E2%2B%28y-1%29%5E2+=+36\"$ \n" ); document.write( "

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