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''to a given straight line (plane)''

A straight line intersecting that straight line (plane) at right angles.

====Comments====
Two lines intersecting at right angles are also said to be orthogonal or perpendicular (cf. also [[Perpendicular straight lines|Perpendicular straight lines]]).

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How to Cite This Entry:
Perpendicular. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Perpendicular&oldid=14970

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