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An octagonal pyramid is an obvious answer but there are infinitely many variations where the base is surrounded by numerous layers of polygons in bands.

For example, an octagonal base, with eight rectangular sides at right angles to the base, topped by eight triangles would be like a stretched pyramid. The rectangular sides can be replaced by trapeziums and no longer be required to be at right angles to the base.

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13y ago
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Q: What 3-D shape has 1 octagonal base?
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