Question 1128073: fine the equation of the circle passing through the point (2,1),(0,-3),(4,3)
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! fine the equation of the circle passing through the point (2,1),(0,-3),(4,3)
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there are several ways to do this, here are 2.
Label the points.
A(2,1), B(0,-3), C(4,3)
Find the equations of any 2 sides, AB & AC, AB & BC or AC & BC
Find the perpendicular bisectors of the 2 sides.
The intersection of the 2 bisectors is the center.
The radius is the distance from the center to any of the 3 points.
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Use a matrix:
| x y x^2+y^2 1|
| 2 1 5 1|
| 0 -3 9 1| = 0
| 4 3 25 1|
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Use can use Excel with the matrix.
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