You can put this solution on YOUR website! Find the equation of the circumcircle of the triangle formed by 2x+y=4, x+2y=5 and x+y=6
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Find the 3 vertices of the triangle. Label them A, B & C.
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Then find the perpendicular bisectors of any 2 sides, AB, AC or BC.
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The intersection of the 2 bisectors is the center of the circle, (h,k).
The distance from the center to A, B or C is the radius.