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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.
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]
Full Transcript
- 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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