P, the 2nd Rigby point P, is constructed as follows:
- Construct three circles, centered at the vertices of triangle ABC and pairwise tangent to one another.
- Construct the outer Soddy circle, which is tangent to all three circles.
- Define the touchpoints A', B', and C' of the outer Soddy circle and the three tangent circles.
- Construct the tangent lines to the outer Soddy circle in A', B', and C'.
- Define A'', B'', and C'', the intersections of these tangent lines.
- Now, the lines A'A'', B'B'', and C'C'' intersect in P, triangle center X(1372).
The barycentric coordinates of this point depend on the lenghts of the sides of the triangle.