A teragon is a polygon with 1 trillion sides, it has a Schläfli symbol {10,18}.

Like the megagon and gigagon, a teragon would appear as a circle to an observer and if blown up to 1000 ly (1/100 the size of the Milky Way Galaxy), it's edge length would be 9.78 cm, and it's perimeter would differ from a circle by 48 µm, and if shrunk to 1 ly, its edge lengths would be 9.78 µm and the perimeter would differ from the circle by 0.048 nm.

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