Concept

Pentagon

Overview

In geometry, a pentagon (from Greek πέντε (pente) 'five' and γωνία (gonia) 'angle') is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.

A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.

Overview adapted from Wikipedia (CC BY-SA 4.0; see the article history for authors).

Philosophers who discussed Pentagon

• Hippasus

Related ideas

• Golden ratio
• Geometry
• Pentagram
• Euclid's Elements
• Circle
• Euclid
• Dodecahedron

Place in the tradition

Part of Pythagoreanism.

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