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Perpendicular

en.wikipedia.org/wiki/Perpendicular

If two lines (a and b) are both perpendicular to a third line (c), all of the angles formed along the third line are right ...

Definition of Perpendicular Lines - Math is Fun

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

Perpendicular Lines. more ... Perpendicular Lines. Lines that are at right angles ( 90°) to each other. Try for yourself: See: Parallel Lines. Next.

Perpendicular lines from equation | Equations of parallel and ...

www.khanacademy.org/math/geometry/analytic-geometry-topic/parallel-and-perpendicular/v/perpendicular-lines

Sal determines which pairs out of a few given linear equations are perpendicular.

Identify parallel and perpendicular lines | Interpreting angles | Khan ...

www.khanacademy.org/math/basic-geo/basic-geo-angles/basic-geo-interpreting-angles/e/recognizing-parallel-and-perpendicular-lines

Recognize parallel and perpendicular lines in geometric figures and pictures.

Slope: Parallel and Perpendicular Lines - Purplemath

www.purplemath.com/modules/slope2.htm

Parallel lines and their slopes are easy. Since slope is a measure of the angle of a line from the horizontal, and since parallel lines must have the same angle, ...

Perpendicular - math word definition - Math Open Reference

www.mathopenref.com/perpendicular.html

Perpendicular means "at right angles". A line meeting another at a right angle, or 90° is said to be perpendicular to it. In the figure above, the line AB is ...

Perpendicular Lines 1 | Coolmath.com

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

Let's graph these lines: * I'm using y = mx + b stuff to graph them!

Parallel and Perpendicular Lines | WyzAnt Resources - Tutors

www.wyzant.com/resources/lessons/math/geometry/lines_and_angles/parallel_and_perpendicular

We will use our previous knowledge of slopes and algebraic equations to learn about parallel and perpendicular lines in the coordinate plane. Although the ...

Parallel and Perpendicular Lines - BrainPOP

www.brainpop.com/math/geometryandmeasurement/parallelandperpendicularlines/

In this educational animated movie about Math learn about intersecting lines, transversals, angles, 2-dimensional, and lines.

Perpendicular Lines - Geometry Made Easy! - Quatr.us

quatr.us/math/geometry/perpendicular.htm

Two lines are perpendicular if they cross at right angles. You can test this by extending the lines until they cross (if they do not cross then they are parallel).

Answers
What Are Perpendicular Lines?
In mathematics, a line is an infinitely long one-dimensional object. It has no start or end, continuing on forever without ever changing direction. More colloquially, a "line" is any straight object, even if it does have an end point. The relationship... More »
Difficulty: Easy
Source: www.ehow.com