# What does it mean to be perpendicular?

For two objects to be perpendicular, they must intersect or meet at a right angle (90 degrees). On a coordinate plane, to be perpendicular means that the slope of one line will equal the negative r... Read More »

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## How to Find the Perpendicular of Two Angles?

Finding the perpendicular angle to two vectors is a crucial part to linear algebra. It can be applied to many other problems, including defining the plane formed by the two vectors and determining ... Read More »
http://www.ehow.com/how_8388390_perpendicular-two-angles.html

## How to Find a Perpendicular Line?

If a line intersects another line at a 90-degree angle, they are perpendicular. You may have to find a perpendicular line as a part of a high school or college algebra or geometry course. You also ... Read More »
http://www.ehow.com/how_8274592_perpendicular-line.html

## How to Prove a Square Is Perpendicular?

A square is a quadrilateral shape that has four sides of equal length and four right angles. It may seem easy to identify a square by sight, but the only way to be sure is to measure it. One method... Read More »
http://www.ehow.com/how_8518169_prove-square-perpendicular.html

## 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 ... Read More »
http://www.ehow.com/how_8508181_vector-perpendicular.html

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