Question 1167506: Find an equation for the circle that goes through the these points (9,2) , (-1,12), and (-9,-4)
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Find an equation for the circle that goes through the these points A(9,2), B(-1,12), and C(-9,-4)
------------------------
Find the perpendicular bisectors of AB and BC
Find the intersection of the 2 bisectors - That's the center of the circle, (h,k).
----
The radius is the distance from the center to any of the 3 points.
==============
------------
Or:
| x y x^2+y^2 1|
| 9 2 85 1|
|-1 12 145 1| = 0
|-9 -4 97 1|
|
|
|
