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en.wikipedia.org/wiki/Orthogonality

The **line** segments AB and CD are **orthogonal** to each other. In mathematics,
orthogonality is the relation of two **lines** at right angles to one another ...

www.artyfactory.com/perspective_drawing/perspective_3.html

There are two types of construction lines used in this perspective drawing: 1)

mathworld.wolfram.com/OrthogonalLines.html

www.creativeglossary.com/art-perspective/orthogonal-lines.html

Definition of

drawsketch.about.com/od/drawingglossary/g/orthogonal.htm

legacy.mos.org/sln/Leonardo/Glossary.html

www.mathopenref.com/orthogonal.html

home.scarlet.be/math/recht.htm

Take two

searchstorage.techtarget.com/definition/orthogonal

It refers to perspective

people.inf.ethz.ch/arbenz/MatlabKurs/node87.html

8.4.2 Fitting

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What are orthogonal lines ?

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Orthogonal lines are two lines which are perpendicular, i.e. 90 degrees, to each other.
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( ör′thäg·ən·əl ′līnz ) (mathematics) Lines which are perpendicular.
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