(upbeat music) (gentle keyboard music) - Oh!

Hey, Blueberry.

- Oh, keep playing.

It's beautiful.

- Well, thanks.

I'm trying to, you know, compose a new song.

- (gasps) You write music?

- Well, I'm working on it.

I'm working on it.

- Oh, you're going to be a rock star, aren't you, Joel?

- Oh, no.

I'm still looking for my big break, you know?

- Oh.

- Yeah.

So, composing is, you know that word?

- Ah!

It's to put stuff together, right?

That's right.

To put stuff together, to create.

So a composer, we often talk about, might be someone who is... - A person who writes music, puts notes together.

- That's it.

That's it.

That's what a composer is doing, right?

And so- - I love music.

- Me too.

Me too.

Composing is actually what our math lesson is about today.

- Oh.

- Yeah.

We're talking about composing shapes.

- Music and math go together?

- Hey, they can.

They can.

- Oh.

- And that word composed is going to be really important today because as we are composing shapes, we're building and creating shapes.

- Oh, okay.

- Just like a composer would... - Would make music and songs.

- That's it.

Okay.

So I have a challenge for us today.

- Ooh.

Okay, I'm ready.

- You ready?

Okay.

So here's our challenge.

I'm going to give a clue, and people are going to try and draw the shape based on the clue that I do.

- Okay.

- You're composing a shape.

- Okay.

Let me get my pencil and paper.

- Okay.

You do that.

- All right, and if you're at home watching this too, make sure that you can practice along with us.

Grab a piece of paper, pen or a pencil, and you can draw the shape as I give a clue too.

So here's our first one.

What if I told you to compose a shape that has three vertices, could you compose a shape that has three vertices?

Now as you're doing this, you might be thinking, "Well, okay, what does that mean exactly again?"

"What are the vertices?"

Remember that a vertex, that's a corner, all right?

So it's where those two lines are coming to a point.

So are you getting it now?

Three vertices.

Maybe you drew.

- I think I got it.

- You got it?

- But it's a triangle.

- A triangle would be a great one.

- Yeah.

- Yeah.

That would be- - Like a hat.

- Like a hat.

That'd be perfect.

Okay.

Let's do another one.

- Okay.

- Let's do another one.

So this time, can you compose a shape that would have four sides- - Oh!

Oh!

Like a block of cheese.

- Oh, it could be a block of cheese.

But this, I'm going to add something to it.

Are you ready?

- Yeah.

I'm ready.

- The straight edges, those sides, - Mm-hmm.

- the lines that are next to each other cannot be the exact same length.

- Oh.

- Mm-hmm.

- You make things hard.

- Little challenge here.

All right.

So as we're thinking through that... Mm.

- Mm.

- What about a rectangle?

- Oh, yeah, that could work.

- You could have drawn a rectangle.

Now, you could not have drawn a square because a square, all the sides of the square- - They're the same.

- They're the same.

And we have to have those different ones.

That's what the challenge was, right?

- Mm-hmm.

- Okay, last one that we're going to compose- - Oh, yeah, one more, one more.

- One more.

Here we go.

How about drawing a shape with six faces?

- Oh!

that sounds like a monster.

That's scary, Joel.

I don't know if we could do that.

- It does.

Well, remember that faces of a shape, when we're talking about that, faces of a shape are going to be a 3D shape.

- Oh!

- Like this cube.

- Like a dice.

- Yes.

That's right.

- Okay.

- So you could have drawn a cube or maybe a rectangular prism, because these are the faces of 3D shapes.

- Well, that's not scary at all.

- That's not too scary.

(Blueberry laughs) - All right, let's try something a little bit different now, Blueberry.

- Okay.

- Rather than composing or creating and building the shape, - Mm-hmm.

- let's try decomposing the shape.

- Oh!

Like that banana in the trash.

- That's right.

Yeah.

The banana in the trash is decomposing because it is breaking down.

- Right.

- Yeah.

So, we're going to be doing that with shape.

So we're going to be breaking down a shape, a composite shape, which is one that has multiple things in it.

Are you ready?

- Yeah.

- Okay.

But, oh!

- Oh!

Oh!

- We need the chalkboard.

- We do.

- I want to do it.

Let me!

Let me!

- Okay.

You do it.

You do it.

(Blueberry clears throat) - Chalkboard!

(Joel clapping) Whoa!

- There it is.

- Well, I need more paper for this.

- Okay.

You go get that.

All right, so as we're looking at our shape here, this is a composite shape because you can see that it's not kind of the normal thing that we are usually might talk about, like a circle or a triangle or one of those flat shapes, but this is different.

It has some multiple things in it.

But our challenge is to decompose this shape.

Can we separate it into shapes that we do recognize?

Well, when you look at this, what do you notice?

Do you notice that there's this kind of weird part at the top?

Well, if we were to maybe separate that out, maybe we draw a line right there.

If I do that, what shape does that create there on top?

I see- - Oh!

It looks like a triangle.

- It's a triangle.

That's right.

Okay.

So, Blueberry's got it.

It's a triangle there.

Now, if we were to do the same on the bottom part 'cause I see that there- - (gasps) There's another one!

- There's another triangle.

So, now we can see that we have two triangles and- - A rectangle!

- The rectangle is left in the middle.

That's great work.

So we just decomposed this composite shape.

All right.

That was excellent work, Blueberry.

Good job.

- Oh!

You make it easy, Joel.

- Oh, okay.

I tell you what, you want to go back to composing a song?

- (gasps) Yes!

I want to write a song with you, Joel.

- Okay.

- Oh, what's the name of the song?

- Ooh, I don't know.

I don't know what it is.

But you know what you should do, you should check out more of Blueberry on Blueberry's Clubhouse, and we'll keep working on our song.

(upbeat music)