lines are parallel.

lines are parallel.

These lines are parallel.

These lines are parallel.

lines are not parallel.

These are parallel lines.

These lines are not parallel.

These lines should be parallel.

These two lines are parallel

So these lines aren't parallel.

Parallel lines, obviously they are two lines in a plane.

And parallel lines are two lines in the same plane.

That's the definition of parallel lines.

Parallel lines have the same slope.

So these two lines are parallel.

The tangent lines should be parallel.

You have a transversal, parallel lines

Test whether two given lines are parallel

Because it tranverses the two parallel lines.

But anyway, so those are parallel lines.

This one maybe won't involve parallel lines.

So we have these 2 parallel lines

lines aren't going to be parallel anymore.

In this video we're going to think a little bit about parallel lines, and other lines that intersect the parallel

That's a parallel line, that's a parallel line, so this is a transversal between two parallel lines.

So first let's think about what a parallel or what parallel lines are.

The blue and the green lines are parallel.

It has parallel lines, which are sun rays.

by alternate interior angles congruent of parallel lines

So we have a transversal between parallel lines.

Because it those two are parallel, then these two lines are transversals of the parallel.

Select the first of the two possibly parallel lines...

Select the other of the two possibly parallel lines...

Line ST is parallel (two lines) to Line UV.

We are asked which of these lines are parallel.

This is a transversal, these two lines are parallel

And Euclid said, How can I define parallel lines?

So parallel lines are lines that have the same slope, and they're different lines, so they never, ever intersect.

lines, we have some transversals and the parallel lines and the transversals actually switch roles

So we can view each of these crossing lines as transversals will between two parallel lines.

lines and graph both of these lines, and verify for yourself that they are indeed parallel.

So parallel lines, and I'm just drawing part of them.

AB amp AC as transversals of those two parallel lines

That's one of my parallel lines, and let me make the green one the other parallel line.

So let's start with the parallel lines and, just as a reminder, two lines are parallel if they're in the same plane, and all of these lines are clearly in the same plane.