Pentagon

usgb/ˈpentəɡɑːn/
noun

A shape with five sides and five angles.

The stop sign is shaped like a pentagon.
Visual representation of "pentagon" - A shape with five sides and five angles.

Often appears as...

  • regular pentagon
  • irregular pentagon
Definition 1 of 2
Visual representation of "pentagon"
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Five Equal Sides

In a regular pentagon, all sides and angles are equal. This is not true for irregular pentagons.

Illustration for Five Equal Sides
A regular pentagon has five sides of the same length.
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Shape Attributes

The term 'pentagon' refers only to the number of sides and angles, not their lengths or angles' sizes.

Illustration for Shape Attributes
A drawing of a house often includes an irregular pentagon to represent a door.
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Math Usage

In math contexts, 'pentagon' often implies a regular pentagon unless specified otherwise.

Illustration for Math Usage
To calculate the area, remember that this is a regular pentagon.
Visual representation of the word "Pentagon"

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