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en.wikipedia.org/wiki/Orthogonality

The

www.artyfactory.com/perspective_drawing/perspective_3.html

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

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

Definition of

www.purplemath.com/modules/slope2.htm

Parallel

home.scarlet.be/math/recht.htm

Take two

www.mathopenref.com/coordperpendicular.html

When two

chortle.ccsu.edu/VectorLessons/vch08/vch08_13.html

Answer: What is the slope of ( 2, 5 )<sup>T</sup> ? m1 = 5/2; What is the slope of ( -5, 2)<sup>T</sup> ? m 2 = -2/5; What is the dot product? (2)(-5) + (5)(2) = 0; What is m1 times m2?

www.mathsisfun.com/perpendicular-parallel.html

www.mathsisfun.com/geometry/parallel-perpendicular-lines-planes.html

OK, an illustration of a plane, because a plane is a flat surface with no thickness that extends forever. But here we show planes with edges just to make the ...

www.coolmath.com/algebra/08-lines/14-perpendicular-lines-01

Let's graph these

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mathworld.wolfram.com

drawsketch.about.com

In Linear Perspective drawing, the diagonal

www.purplemath.com

Demonstrates how to find parallel and