pentagonal

/pen'tægənl/

Thân thiện

A child draws a pentagonal shape on a piece of paper.

Definition

1. Adjective:
   • Having five sides and five angles: Describes a shape that is a polygon with exactly five straight sides and five interior angles.
   • Relating to or resembling a pentagon: Pertaining to the geometric figure known as a pentagon.

Usage

• The word "pentagonal" is used to describe the specific geometric property of having five sides. It is commonly used in mathematics, geometry, architecture, and design.
• It functions as an attributive adjective (e.g., ) or a predicative adjective (e.g., ).

Examples

• Attributive use:
  • The courtyard was designed in a pentagonal pattern.
  • A pentagonal prism has two parallel pentagonal bases.
• Predicative use:
  • The new fort's layout is distinctly pentagonal.
  • Is this tile pentagonal?

Advanced Usage

• "Pentagonal number": In number theory, a figurate number that can represent a pentagon.
  • The fifth pentagonal number is 35.
• "Pentagonal pyramid": A polyhedron formed by connecting a pentagonal base to a point (apex).
  • The crystal's structure resembled a pentagonal pyramid.

Variants and Related Words

• Pentagon (n): A plane figure with five straight sides and five angles.
  • The headquarters of the U.S. Department of Defense is called The Pentagon.
• Pentagonally (adv): In a pentagonal manner.
  • The tiles were arranged pentagonally.

Synonyms

• Five-sided: Having five sides (a more general, less technical synonym).

Antonyms

• Non-pentagonal: Not having five sides. (Note: There is no single common antonym; antonyms are typically other specific shapes like , , , etc.)

Học thuật

Adjective

1. of or relating to or shaped like a pentagon

Từ đồng nghĩa

• pentangular