# How to Know If a Vector Is Perpendicular?

Perpendicular vectors on a graph cross each other at 90 degree angles. If you have a printed graph and a protractor or T-square, you can measure the angles of intersection manually to determine if ...
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http://www.ehow.com/how_8508181_vector-perpendicular.html

## How to Find the Perpendicular Line to a Vector?

Vectors are lines with direction and magnitude, and are a concept most commonly used in calculus and physics. If you want to find a line perpendicular to a vector, you need a line whose slope multi...
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http://www.ehow.com/how_8439289_perpendicular-line-vector.html

## How to Know if Two Lines Are Perpendicular in Trigonometry?

Though many people will have encountered trigonometry in school and then forgotten all about it, this branch of mathematics is vital to any number of activities, from construction to navigation. Tr...
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http://www.ehow.com/how_8436065_two-lines-perpendicular-trigonometry.html

## How to Know if the Graph Is Parallel, Perpendicular or Neither?

In algebra and geometry, it can be important to determine whether graphs are parallel or perpendicular. Parallel lines never intersect, while perpendicular lines intersect at right angles. Determin...
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http://www.ehow.com/how_8502255_graph-parallel-perpendicular-neither.html

## How to Create Perpendicular Lines?

Perpendicular lines intersect each other to create four 90-degree angles. While it would be fairly easy to create some lines that are roughly perpendicular, if you want to create perfectly perpendi...
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http://www.ehow.com/how_8456578_create-perpendicular-lines.html