Definition

1. Noun:
   • A seven-sided polygon: A closed two-dimensional geometric figure with exactly seven straight sides and seven angles.

Usage Examples

• Noun:
  • The architect designed a unique building with a heptagon as its floor plan.
  • A regular heptagon has seven sides of equal length and seven equal angles.

Advanced Usage

• "Regular heptagon": A specific type of heptagon where all seven sides are of equal length and all interior angles are equal (approximately 128.57 degrees each).
  • Constructing a perfect regular heptagon with only a compass and straightedge is classically impossible.

Variants and Related Words

• Heptagonal (adj): Having the form or properties of a heptagon.
  • The heptagonal shape of the coin made it distinctive.

Synonyms

• Seven-sided polygon: The direct descriptive synonym.
• Septagon: A less common, alternative term for a seven-sided polygon.

Notes

• The term is derived from Greek: (seven) and (angle).
• It is a specific term in geometry, distinct from other polygons like a hexagon (six sides) or an octagon (eight sides).

Noun

1. a seven-sided polygon