pentagonal
/pen'tægənl/
Definition
- 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.)
Adjective
-
of or relating to or shaped like a pentagon
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