Well, you can’t have a 7-sided polyhedron where all the faces are the same; that requires an even number. But you could make a die if it doesn’t conform to those rules:
- Let some faces be different. A pentagonal prism has 7 faces, five rectangles and two pentagons, and then they need to be just the right size to make it fair.
- Add faces that don’t count. You could make something based on a heptagonal pyramid or prism, but that won’t balance on the bases.
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