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Math 4: What Line is it Anyway? 21 Views


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Description:

Time to learn about the three kinds of lines - parallel, perpendicular and squiggly. Well, okay - squiggly lines are a little advanced, so we'll get into them later.

Language:
English Language

Transcript

00:14

The world is filled with lines: clotheslines, hemlines, bylines, online, punchlines, "Whose Line"? [Clothesline with pictures pegged to it]

00:20

…Whoa.

00:21

We got carried away.

00:22

…Whatever, we just really love lines…

00:24

But today, we’re going to exercise a bunch of self-control and only talk about two kinds [Hand pulls perpendicular and parallel out of a cookie jar]

00:28

of lines: perpendicular and parallel.

00:31

Let’s start with lines that are perpendicular.

00:34

Imagine two lines are moving towards each other.

00:36

If the spot where they intersect, aka meet, forms a ninety-degree angle like so… [Arrow pointing to the intersection]

00:41

… then we say those lines are “perpendicular.”

00:44

By the way, that 90-degree angle is pretty famous…it also goes by the name, "right

00:49

angle"…

00:50

…because its so stylin', it makes all other angles look wrong. ['Sunglasses appear over right angle]

00:53

…Okay, that's not the actual reason, whatever. [No sign appears]

00:56

It actually has something to do with Latin, but that's way less fun.

00:59

Then there are parallel lines. [Parallel line sign stuck in an empty field]

01:01

These are the tragic star crossed lovers of the line-world.

01:03

That’s because, no matter how much they might want to meet, they’re doomed to run

01:07

on and on forever – always next to each but never intersecting…

01:11

We're guessing this is what inspired Shakespeare to write Romeo and Juliet. [Theater performance of Romeo and Juliet]

01:15

You can find these lines everywhere you look.

01:18

Next time you're answering nature's call, check out the tiling on the floor! [Phone shows 'Nature ringing']

01:21

You just might spy parallel lines…

01:24

…and some perpendicular ones. [Lines highlighted in tile flooring]

01:26

Parallel and perpendicular lines can be found outside of the throne room, too. [Guy walks out of toilet]

01:30

Take our streets, which are often full of both parallel…

01:33

… and perpendicular lines.

01:34

In fact, it’s why we call the place where the lines of two streets intersect an… intersection.

01:39

Oh, and driving pro-tip: while two streets can manage to run perpendicular just fine, [Woman driving a car]

01:45

the same can’t be said of two cars. [She stops to find a pile of burning cars]

01:46

And just in case you were thinking, "man, I almost get it, but if only I had one more

01:51

example!!!" then wow, it's your lucky day! [Man walking in a city]

01:54

…Well…lucky-ish.

01:55

It'd probably be cooler to find $20 on the ground, but whatever. [$20 floats to the floor]

01:58

Train-tracks are another example where you can find both the parallel lines of the rails…

02:03

And the perpendicular lines of the tracks.

02:05

So there ya have it!

02:06

You can find lines everywhere you look!

02:08

Especially if you happen to be looking in Disneyland.

02:10

They should really set up cots to take naps in… [Long queue at Disneyland]

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