Is it possible to have a 7 sided dice?

First, it is definitely theoretically possible to have a seven-sided die. The die as shown is a pentagonal prism. Geometrically, the die’s fairness is most strongly affected by the size ratio of the pentagonal faces to the rectangular sides.

Do nine sided dice exist?

Nine-sided Die

Nine-sided d9 die. This design is based on spacing points as equally as possible on a sphere and then cutting planar slices perpendicular to those directions.

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