code: func (p *Point) SquaredDistanceFrom(point *Point) float64 {
  	d0 := (point[0] - p[0])
  	d1 := (point[1] - p[1])
  	return d0*d0 + d1*d1
  }
docs: // SquaredDistanceFrom returns the squared Euclidean distance between the points.
  // This avoids a sqrt computation.