enneagon

A teacher draws a large enneagon on the chalkboard.

Definition

1. Noun:
   • A nine-sided polygon: "enneagon" refers to a geometric shape with nine straight sides and nine angles. It is a type of polygon, commonly studied in geometry.

Usage Examples

• Noun:
  • The architect designed a building with an enneagon as its floor plan. (A building whose base is a nine-sided geometric shape.)
  • In mathematics class, we learned how to calculate the interior angles of an enneagon. (A nine-sided polygon.)

Advanced Usage

• "Regular enneagon": an enneagon where all sides are equal in length and all interior angles are equal.
  • A regular enneagon has interior angles of 140 degrees each. (A specific type of nine-sided polygon with uniform sides and angles.)

Variants and Related Words

• Enneagonal (adj): relating to or having the shape of an enneagon.
  • The enneagonal pattern was used in the mosaic. (The pattern was based on a nine-sided polygon.)

Synonyms

• Nonagon: another term for a nine-sided polygon, more commonly used in modern geometry.
  • Both enneagon and nonagon describe the same shape. (They are interchangeable terms.)

Related Idioms

• (None commonly associated with this technical term.)