# Duoantifastegiaprism

The height of an equilateral (and hence scaliform) n-m duoantifastegiaprism of unit edge length is given by ${\displaystyle \sqrt{\frac{2-\frac{1}{1+\cos\frac{\pi}{m}}-\frac{1}{1+\cos\frac{\pi}{n}}}{2}}}$. If the solution has zero height, satisfied only for (n = 2, m = 2 and n = 5, m = 5/3), then its duoantiprismatic equivalent can be made uniform, which are the hexadecachoron and the great duoantiprism respectively.