Perpendicular

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Perpendicular

Perpendicular (/pɜːrˌpɛndɪˈkjʊlər/; from Latin perpendiculum, meaning "plumb line") is a term used in geometry to describe a relationship between two lines which meet at a right angle (90 degrees). The term can also be used to describe a line or plane that is at a right angle to another line or plane.

Etymology

The term "perpendicular" comes from the Latin perpendiculum, which means "plumb line". This is a reference to the tool used by builders to ensure that their constructions are "straight up and down", or vertical. The word has been used in English since the 14th century.

Related Terms

  • Right angle: An angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.
  • Orthogonal: Of or involving right angles; at right angles.
  • Normal (geometry): In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object.
  • Vertical: Being in a position or direction perpendicular to the plane of the horizon; upright; plumb.

See Also

External links

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