The spherical tetrahedron ACCD

In this conformal image the yellow-brown sphere is the equator between 1 and -1. The tetrahedron is positioned with vertices 1,i,j,a. The four vertices are colored violet; the other group points are colored blue. Here 1 is at the top, i is on the left, j is at the bottom and a is on the right. The group point -b^2 is the midpoint between i and a; -c^2 is the midpoint between j and a. The group point d appears in the interior of the face iaj.

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