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

Illustrated definition of Perpendicular Lines: Lines that are at right angles (90deg) to each other. Try for yourself:

www.splashlearn.com/math-vocabulary/geometry/perpendicular

Perpendicular - Definition with Examples. The Complete K-5 Math Learning Program Built for Your Child. Parents, Sign Up for FreeTeachers, Sign Up for Free.

www.splashlearn.com/math-vocabulary/geometry/perpendicular-lines

In geometry, a branch of mathematics, perpendicular lines are defined as two lines that meet or intersect each other at right angles (90°). Perpendicular Lines ...

en.wikipedia.org/wiki/Perpendicular

In elementary geometry, the property of being perpendicular (perpendicularity) is the ... This definition depends on the definition of perpendicularity between lines. Two planes ...

www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-geometry/cc-8th-angles-between-lines/v/identifying-parallel-and-perpendicular-lines

Perpendicular lines are lines that intersect at a right (90 degrees) angle. ... which fits the definition because two lines being parallel implies they are in the same ...

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 ...

www.cuemath.com/geometry/perpendicular

Perpendicular lines, in math, are two lines that intersect each other and the angle between them is 90°. The symbol used in between the two lines to say that they ...

mathbitsnotebook.com/Geometry/ParallelPerp/PPdefinitions.html

Two lines are parallel if and only if they lie in the same plane and do not intersect. Parallel lines never cross. · A transversal is a line that intersects two or more&nbs...

www.dictionary.com/browse/perpendicular

Geometry. meeting a given line or surface at right angles. maintaining a standing or upright position; standing up.

www.youtube.com/watch?v=VVvErpLG2EQ

Oct 31, 2007 ... For a complete lesson on perpendicular lines, go to http://www.MathHelp.com - 1000+ online math lessons featuring a personal math teacher ...