So, out of curiosity, what is the purpose of putting feet on a cutting board? I haven't noticed our boards sliding around on the counter. And we can use both sides of our boards.
Although the board is flat, the countertop is not necessarily (mine is not). The rubber feet help prevent any rocking, make it easier to pick up, and help prevent it from warping due to a little bit of airflow under it.
Hmmm...I wonder if it will still rock with 4 feet? I guess that depends on the nature of the irregularity.
I've never considered (or seen) a triangular cutting board, but since 3 points define a plane....Naaah, a triangular cutting board would be strange.
Although the board is flat, the countertop is not necessarily (mine is not). The rubber feet help prevent any rocking, make it easier to pick up, and help prevent it from warping due to a little bit of airflow under it.