octagon

/'ɔktəgən/

Thân thiện

A red stop sign has the shape of an octagon.

Definition

Noun: 1. A plane figure with eight straight sides and eight angles: In geometry, an octagon is a polygon that is closed and has exactly eight sides and eight vertices (corner points). All sides are line segments, and all interior angles typically sum to 1080 degrees.

Examples of Usage

Advanced Usage

• Regular Octagon: A specific type of octagon where all eight sides are of equal length and all eight interior angles are of equal measure (each 135 degrees). This is the most commonly referenced form.
• Irregular Octagon: An octagon where the sides and angles are not all equal.
• In architecture and design: The term is often used descriptively for rooms, windows, towers, or layouts that have an eight-sided plan.

Variants and Related Words

• Octagonal (adjective): Having the form or characteristics of an octagon.
  • The room featured an octagonal skylight.
• Octangle (noun): A less common synonym for octagon.

Synonyms

• Eight-sided polygon
• Octangle

Related Phrases and Concepts

• Polygon: The general category of closed plane figures with three or more straight sides, of which an octagon is a specific type (an 8-gon).
• Perimeter of an octagon: The total distance around the outside of the octagon.
• Area of an octagon: The measure of the two-dimensional space enclosed by the octagon.

Học thuật

Noun

1. an eight-sided polygon