Find the midpoint of the diameter to find the center of the circle: ( (13)/2, (4+2)/2) = (1, 3) The distance from the center to one of the endpoints is the radius: sqrt(2^2 + 1^2
http://answers.yahoo.com/question/index?qid=201109...

1. Write down the standard form of the circle's equation (x  h)2 + (y  k)2 = r^2. 2. Substitute h with the center's xcoordinate, k with its ycoordinate, and r with the circle's
http://www.ehow.com/how_8553188_writeequationcir...

Hello Posh, Okay, let's do this by an example. You have to "complete the square" in both x and y. Let's say we have the equation: x^2  6x + y^2 + 10y + 8 = 0
http://en.allexperts.com/q/AdvancedMath1363/math...
