a straight line at right angles to another line

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what does perpendicular mean

per·pen·dic·u·lar

[pur-puhn-dik-yuh-ler]

ADJECTIVE

1.

vertical; straight up and down; upright.

2.

Geometry meeting a given line or surface at right angles.

3.

maintaining a standing or upright position; standing up.

4.

having a sharp pitch or slope; steep.

5.

(initial capital letter) noting or pertaining to the last style of English Gothic architecture, prevailing from the late 14th through the early 16th century and characterized by the use of predominantly vertical tracery, an overall linear, shallow effect, and fine intricate stonework.

Source:
Dictionary.com

Perpendicular is a term often used in mathematics. When something is perpendicular to something else, it means that it is standing straight up from it and that there is a 90 degree angle on each side.

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