Joined penteract

The joined penteract, also known as the cubic-tegmatic tetracontateron, is a convex isoteric polyteron with 40 identical cubic tegums as tera. It can be obtained as the dual of the uniform rectified triacontaditeron.

It can also be obtained as the convex hull of a penteract and a triacontaditeron, where the edges of the triacontaditeron are $$\sqrt2 ≈ 1.41421$$ times the length of those of the penteract.