What is a 69-sided polygon called?

Question

What is a 69-sided polygon called? Could you please provide the name quickly? Thanks in advance.

Adeline Goyette · Accepted Answer

A 69-sided polygon is called a hexacontakaienneagon—derived from the prefix for 60, hexacontakai, and the prefix for 9, ennea.

Naming Polygons via kwout

Naming a polygon by its number of sides requires knowledge of the appropriate Greek prefixes along with some rules for their use.

For polygons with 3 through 20 sides, simply add "gon" to the prefixes on the right (although a trigon is more commonly called a triangle, and a tetragon, a quadrilateral).

For polygons with more than 20 sides, we "construct" the name by using so-called combining prefixes.

To "construct" a name, we start with the prefix for the tens digit, follow it with "kai" (the Greek word for "and"), then follow it with the prefix for the units digit, and finally add "gon."

Example: A 35-sided polygon is called a "triacontakaipentagon" {30 (triaconta) + and (kai) + 5 (penta) + gon}.

Naming Polygons via kwout

For numbers from 100 to 999, we need one more combining prefix and another rule.

To "construct" the name, we start with the prefix for the hundreds digit taken from the "Ones Digit" table above, follow it with "hecta" (100), then proceed as before.

Example: A 672-sided polygon is called a "hexahectaheptacontakaidigon" {600 (hexa + hecta) + 70 (heptaconta) + and (kai) + 2 (di) + gon}.

Madie Hilpert

What is a 69-sided polygon called?

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