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en.wikipedia.org/wiki/Perpendicular

Therefore, in Euclidean

www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/perpendicular-lines

High school

www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/e/line_relationships

Use your knowledge about the slopes of parallel and

www.khanacademy.org/math/basic-geo/basic-geo-lines/parallel-perp/v/parallel-and-perpendicular-lines-intro

Parallel lines never intersect, and

www.mathsisfun.com/definitions/perpendicular-lines.html

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-angles/v/identifying-parallel-and-perpendicular-lines

Learn to identify parallel and

www.mathopenref.com/perpendicular.html

... right angles'. A line is perpendicular to another if they meet at 90 degrees. ...
relationship. For more on this, see

www.mathopenref.com/coordperpendicular.html

How to determine if

www.mathopenref.com/constperpextpoint.html

This page shows how to construct a

www.ixl.com/math/geometry/equations-of-parallel-and-perpendicular-lines

Fun math practice! Improve your skills with free problems in 'Equations of parallel
and