Circle Through Three Points
- Ryan Hirst
Vector intersection of two lines: http://www.geogebratube.org/material/show/id/38384
- Since u, v, w form a triangle, u x v = v x w = w x u So the unsigned product |(u x v)| can be replaced with any pair of the vectors u, v, w, in any order.
- I used three vectors for algebraic simplicity. It is straightforward to unpack w into u and v.