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From Greek duo "two" + deka "ten" + gonia . You can understand why a hexagon is called a hexagon using the same idea. Hex referring to 6 and gonia again. Now how about a nonagon. Nope, not greek, it comes from the latin word for 9 which is nonus. So it does not always work.

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15y ago
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Q: Why is a twelve sided shape called dodecagon?
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