Question 853690
CLUE:  A circle is the set of points equally distant from a specific point.  The radius is the distance between any point on the circle and the center.


STRATEGY:  Use the distance formula to find the value for the radius.  Build the equation of your circle into the standard form equation for a circle.


KNOWLEDGE:  Standard Form Equation for a circle is {{{(x-h)^2+(y-k)^2=r^2}}}, and the center is (h,k); and the radius is r.
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Distance Formula:  {{{sqrt((x-u)^2+(y-v)^2)}}} between points (x,y) and (u,v).