Function robust_geo::sign_det_x_x2y2

pub fn sign_det_x_x2y2(a: Vector2<f64>, b: Vector2<f64>, c: Vector2<f64>) -> f64

Computes the determinant of the following matrix

┌─                       ─┐
│ a.x   a.x^2 + a.y^2   1 │
│ b.x   b.x^2 + b.y^2   1 │
│ c.x   c.x^2 + c.y^2   1 │
└─                       ─┘

and returns a number with the same sign as the determinant, or 0 if the determinant is 0