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Rachel's definition of parallel lines is technically correct: if \ell and m are both perpendicular to a traverse line t then \ell and m are parallel. · It is ...

www.math-only-math.com/properties-of-parallel-lines.html

What are Parallel Lines? Two lines in a plane are said to be parallel if they do not intersect, when extended infinitely in both the direction. Also, the ...

tutors.com/math-tutors/geometry-help/proving-lines-are-parallel

Parallel Lines Cut By A Transversal Creating Eight Angles ... school teacher for 27 years, including 15 years as a mathematics teacher.

www.mathopenref.com/parallel.html

To show that lines are parallel, we draw small arrow marks on them. In the figure above, note the arrows on the lines PQ and RS. This shows that these lines are ...

brilliant.org/wiki/parallel-lines

Parallel lines are lines in a plane which do not intersect. Like adjacent lanes on a straight highway, two parallel lines face in the same direction, ...

mathbitsnotebook.com/Geometry/ParallelPerp/PPdefinitions.html

Parallel lines are marked with "feathers" (arrows) such as > or >>. The notation to indicate parallel lines are two vertical bars | |. Line m being parallel to&n...

www.ixl.com/math/lessons/transversals-of-parallel-lines

When a pair of parallel lines is crossed by another line, called a transversal, the angles formed have special relationships.

www.coolmath.com/algebra/08-lines/13-parallel-lines-01

Parallel Lines · So, two lines are parallel if they have the same slope. · The problems in this section (and the next) are cool because they pull together a bunch&nbs...