No problem Orangery, i am very patient
.
And to answer your question:
- the D10 with 4-fold symmetry is clearly unstable if you put it on the round part, so it will never stop on an unvalid position.
- the D10 with 5-fold symmetry can keep its balance on the round area but it is very difficult to obtain, so if you roll it, it will never stop on the round face either.
- for the D10 with 3-fold symmetry, it is easier for it to keep its balance on a rounded area because the numbers are carved there (and so the rounded area is not perfectly round). But once again, when I roll it, it has never stopped in such a position.
So to conclude,
when you actually roll them, they do not stop on the rounded part (or, at least, I never managed to do so
)