How to Graph a Circle
 Write the equation in standard form x^{2} + y^{2} = r^{2}
 Determine the center and graph it.
 If the center is not (0,0), remember it's the (h,k) of (x  h)^{2} + (y  k)^{2} = r^{2}.
 Determine the radius.
 Graph four points.
 The distance from these four points to the center must be equal to the length of the radius.
 Connect the points with a circle.
