Plot circle through 3 points

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Dominique Andriessen
回答： Joseph Cheng 2015-3-20
How can i plot a circle through 3 points?
the points are:
X Y Z
point 1: 80,2 314,5 2,5
point 2: 86,7 303,3 2,4
point 3: 73,7 303,3 2,4
Thank you

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回答（1 个）

Joseph Cheng
Joseph Cheng 2015-3-20
You'll find the center point of the circle by finding the intersection of two lines.
Start off by calculating the line equation for two lines pairs say points 1 to 2 and 2 to 3. then the center point is the intersections of the perpendicular bisection of these two lines.
a quick online search has diagrams here http://www.mathopenref.com/const3pointcircle.html

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