Posted by Kim on Sunday, October 10, 2010 at 5:21am.
A general equation could be written:
(x-a)^2 + (y-b)^2 = c^2
where c is the radius of the circle.
You can use the coordinates of the three given points to get three equations in three unknowns.
(-1-a)^2 + (2-b)^2 = c^2
(2-a)^2 + (6-b)^2 = c^2
(6-a)^2 + (3-b)^2 = c^2
Then solve for a, b and c
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