decagonal

A child draws a decagonal stop sign in art class.

Definition

1. Adjective:
   • Relating to a decagon: "decagonal" describes something that has ten sides or is shaped like a decagon (a polygon with ten straight sides and ten angles).

Usage Examples

• Adjective:
  • The decagonal table was specially designed for the geometry classroom. (The table has ten sides, making it a decagon.)
  • Ancient coins sometimes feature a decagonal shape for decorative purposes. (The coins are ten-sided.)
  • The decagonal prism in the physics lab refracts light into a unique pattern. (The prism has a base with ten sides.)

Advanced Usage

• "decagonal prism": a three-dimensional geometric solid with two parallel decagonal bases and rectangular lateral faces.

  • Students were asked to calculate the volume of a decagonal prism in their homework. (A prism with ten-sided bases.)

• "decagonal number": a figurate number that represents a decagon, often studied in number theory.

  • The sequence of decagonal numbers begins with 1, 10, 27, and 52. (Numbers that form a decagonal pattern.)

Variants and Related Words

• Decagon (n): a polygon with ten sides and ten angles.

  • A regular decagon has equal sides and equal angles. (The shape itself.)

• Decagonal (adj): as defined above, the adjective form.

Synonyms

• Ten-sided: having ten sides.
  • The ten-sided figure is called a decagon. (A direct synonym for "decagonal" in geometric contexts.)

Related Idioms

• No common idioms are associated with "decagonal" due to its specialized geometric meaning.