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

... lines in a plane that are always the same distance apart. Parallel lines never intersect. Perpendicular lines are lines that intersect at a right (90 degrees) angle.

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

These lines always intersect at right angles. · If two lines are perpendicular to the same line, they are parallel to each other and will never intersect.

www.varsitytutors.com/hotmath/hotmath_help/topics/perpendicular-lines-and-slopes

Perpendicular Lines and Slopes. Perpendicular lines are lines that intersect at right angles. If you multiply the slopes of two perpendicular lines in the plane, you ...

en.wikipedia.org/wiki/Perpendicular

In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees).

www.cliffsnotes.com/study-guides/geometry/fundamental-ideas/lines-intersecting-perpendicular-parallel

Two lines that intersect and form right angles are called perpendicular lines. The symbol ⊥ is used to denote perpendicular lines. In Figure , line l ⊥ line m.

linesanglesshapes.weebly.com/parallel-perpendicular-and-intersecting-lines.html

The lines are the same distance apart and will never intersect each other. The symbol for parallel lines is ||. In the picture below we see that AB is parallel to CD. It ...

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

When a line is perpendicular to two lines on the plane (where they intersect), it is perpendicular to the plane. plane perpendicular. It will also be perpendicular to ...

www.montereyinstitute.org/courses/DevelopmentalMath/COURSE_TEXT2_RESOURCE/U07_L1_T2_text_container.html

Perpendicular lines are two lines that intersect at a 90º (right) angle. And perpendicular line segments also intersect at a 90º (right) angle. You can see examples ...

www.mathatube.com/geometry-intersec-parallel-perpendi

Perpendicular lines crosses each (intersect) to form a right angle or 90 degree angle. symbol is Perpendicular.

mathbitsnotebook.com/Geometry/ParallelPerp/PPperp.html

Thus, a right angle also exists where line t intersects line n. perp3. 4. theoremsmall In a plane, if two lines are perpendicular to the same line, the two lines are ...