Definition

1. Noun:
   • An eleven-sided polygon: A closed two-dimensional geometric figure with exactly eleven straight sides and eleven angles.

Examples of Usage

• Noun:
  • The architect designed a unique building with an undecagon as its floor plan.
  • In geometry class, we learned how to calculate the interior angles of an undecagon.

Advanced Usage

• Mathematical Context: The term is used in geometry to classify polygons based on their number of sides. An undecagon is a specific type of polygon, distinct from a decagon (10 sides) or a dodecagon (12 sides).
  • The sum of the interior angles of a regular undecagon is 1620 degrees.

Variants and Related Words

• Hendecagon (n): A synonym for undecagon, also meaning an eleven-sided polygon. "Hendecagon" is derived from Greek, while "undecagon" is derived from Latin.
  • Some mathematicians prefer the term 'hendecagon' over 'undecagon'.

Synonyms

• Hendecagon: An eleven-sided polygon.
• 11-gon: A polygon with eleven sides (a more technical term).

Noun

1. an eleven-sided polygon