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www.khanacademy.org/math/basic-geo/basic-geo-angle/angles...

Parallel lines never intersect. Perpendicular lines are lines that intersect at a right (90 degrees) angle. Parallel lines are 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.mathsisfun.com/perpendicular-parallel.html

Perpendicular and Parallel Perpendicular. It just means at right angles (90°) to.. The red line is perpendicular to the blue line: Here also: (The little box drawn in the corner, means "at right angles", so we didn't really need to also show that it was 90°, but we just wanted to!). Try for yourself:

www.homeschoolmath.net/.../g/parallel_and_perpendicular.php

Parallel and Perpendicular Lines. This lesson explains what are parallel and perpendicular lines and has varied exercises for the students. The lesson also includes a video where I show how to draw a perpendicular line and a rectangle using a protractor or a triangular ruler.

en.wikipedia.org/wiki/Perpendicular

The Droz-Farny line theorem concerns a property of two perpendicular lines intersecting at a triangle's orthocenter. Harcourt's theorem concerns the relationship of line segments through a vertex and perpendicular to any line tangent to the triangle's incircle. Quadrilaterals

www.answers.com/Q/What_are_perpendicular_line_segments

A sole line can't be perpendicular. To be perpendicular, a line has to meet with another line, to form right angles on either side. Perpendicular is the exact opposite of parallel.

study.com/academy/lesson/what-are-perpendicular-lines...

Perpendicular Lines. We see perpendicular lines every day. They are present in something as simple as certain letters of the alphabet (specifically, E, F, H, L, and T) or the streets we encounter ...

tutors.com/.../geometry-help/parallel-and-perpendicular-lines

Like parallel lines, examples of perpendicular lines surround us, in walls meeting floors and ceilings, in floor tiles, in bricks in walls, in window grilles. The margin line on a sheet of notebook paper is perpendicular to the parallel writing lines. Parallel and Perpendicular Line Equations

www.reference.com/math/parallel-line-segments-bc39193dd33a12aa

Parallel line segments are any two line segments that run parallel to each other, which means that they will never cross. The length or thickness of each line does not matter. In theory, all line segments are infinitely long. For practical purposes, people work with line segments, which are sections of the line.

www.eduplace.com/math/mthexp/g3/challenge/pdf/cm_g3_a_2.pdf

Write the letters that have parallel line segments. 2. Write the letters that have perpendicular line segments. 3. Write the letters that are made up of line segments that are neither parallel nor perpendicular. 4. Extend It In the drawing below, are the line segments parallel, perpendicular, or neither? Explain your answer. A–2

www.quora.com/What-are-real-life-examples-of-perpendicular...

Real life examples of perpendicular lines surround us. They are in buildings, in rooms, television sets, bookshelves and so on. If you are in a room, more than likely you are surrounded by four walls that are all perpendicular to each other. Where they meet creates a line. The ceiling is perpendicular to all four walls, and so is the floor.