# Lesson video

In progress...

Hello, it's Miss Brinkworth here again to carry on your maths lessons on shapes this week.

Okay, let's have a look at today's learning.

So today, we're going to be learning to draw 2-D shapes.

Now this is going to be building on Mr. Etherton's work from yesterday, where you talked about the properties of shapes.

So you don't need much for today's lesson: a pencil and something to write on.

But here's our vocabulary for today.

A lot of this- a lot of these words you will have heard already, so hopefully you'll be familiar with a lot of them.

So, if I say them and you could repeat, that would be wonderful.

We've got side, vertex, right angle, acute, obtuse, perpendicular, and parallel.

So I'll just give you a chance to have a look at that vocabulary.

What we're going to do is just look at them in a little bit more detail now.

Just to make sure that we're revising them and that they're clear in the top of your head.

'Cause they're going to be really important for today's learning.

So, these are the three we're going to look at first: right angle, acute, and obtuse.

These all come together, they describe the size of angles.

Can you remember what type of angles they are describing? Here's a picture you've seen before.

So, a right angle, if we talk about those angle arms that we used to talk about.

You have a line that goes straight up and a line that comes straight out is a right angle.

And then the two angles are either smaller, which makes it acute.

So with the arms of the angle are closer together than a right angle.

A smaller angle than a right angle.

Or they're further apart, and that is obtuse.

So those are your angle vocabulary that we're going to be using today to discuss 2-D shapes.

Okay, moving on to some more of that key vocabulary: side and vertex.

Now again, these are ways that describe 2-D shapes.

Can you remember what a side and a vertex are? Well here's a picture to help you.

So beside is the long line of a 2-D shape.

And the vertex are where those lines meet at corners.

Side and vertex.

Let's give you a chance to have a look at that picture.

So you can see you got a square there, and it's got four sides and four vertex.

And more than one vertex is a vertices.

Okay, let's have a look at one more slide of our key words for today.

And these are words from last week: parallel and perpendicular.

Can you remember which one's which? Let's just have a look at a picture to help you.

Parallel are those train tracks, where they stay the same distance apart, they aren't any further or closer apart.

Parallel lines.

And perpendicular are when they meet at a right angle.

Like all of these examples here, where they meet at a right angle.

Remember that parallel and perpendicular come in pairs.

We talk about pairs of parallel and perpendicular lines.

Well done, I'm sure you remembered lots of that vocabulary.

Okay, here's a little warm-up then, which is a really similar task to the ones you did in the last lesson.

Having a look at this shape, can you name the number of- can you decide how many sides it's got, how many right angles it's got, acute angles, obtuse angles, parallel and perpendicular lines.

All of those star words we just talked about.

And if you'd like a little bit of a challenge, is this a rectangle? Yes or no? And then have a go at explaining why or why not.

Pause the video here and have a go at that little warm-up activity.

Okay, let's see how you've got on.

So this shape has four sides, if it's a four-sided shape, it is a.

We've gotten lots of work on that.

Okay, how many right angles does this shape have? It has zero right angles.

Acute angles, so smaller than right angles? It has two acute angles.

It has two obtuse angles.

Can you see which ones are acute and which ones are obtuse? And then for parallel lines, it has two pairs of parallel lines.

So it's got the ones going down the sides, and it's got the top and the bottom.

Two pairs of parallel lines.

How many pairs of perpendicular lines does it have? Well we've been given a clue.

If this shape doesn't have any right angles, it doesn't have any perpendicular lines.

Well done if you got all of those right, year three.

If you made some mistakes, just have a good look at that now.

And just have a look at the right answers.

Okay what about that challenge then, is this a rectangle? It's not a rectangle, it is a quadrilateral, it does have four sides.

But it's not a rectangle, so well done if you could see that.

Why isn't it a rectangle though? What is it about this shape that means it's not a rectangle? Have a good look.

Rectangles have right angles.

This shape has no right angles it can't be a rectangle.

This shape is actually called a parallelogram.

Okay, let's learn then.

So, today we'll be doing quite a lot of this where we are reading the description and matching the shape, putting the shape in the right part of the table by the description.

So, one of these shapes has only one right angle.

One has more than four angles, and then we have at least one angle greater than a right angle which we know is called obtuse.

And one angle smaller than a right angle, which we know is acute.

So, how are we going to answer this question then? You can start in any order you'd like.

I quite like starting at the top in this question.

Because the question says, "Only one right angle." Now I can only see one shape there that has a right angle, I could always use my trusty, old right angle checker to check if it's a right angle or not.

But there's only one shape there that's got a right angle.

Can you see it? Shape A there is the only shape with a right angle, it is actually a right-angled triangle, well done if you could remember that.

Okay let's move on then.

Which one has more than four angles? Well there's only one shape there that has more than four sides, and that is shape B.

So it's got- how many sides does it got? Six, it's a hexagon.

So six sides and six angles.

Okay for the last two, actually either of the remaining shapes could fit into those.

Because both of the remaining shapes have got acute angles and obtuse angles.

So B or D could be either way around, they could fit into both of those boxes there.

Okay, your turn then.

Pause the video here and have a go at putting these shapes into the right boxes.

Or just the letters is absolutely fine.

Obviously there's more letters than there are boxes, so some boxes have more than one letter in.

So pause here and have a go.

How did you get on? I wonder where you started, again, did you start with the one that's just got one right angle? Because that's very similar to the one we've already seen.

Or are you very confident with the ones that've got more than four right angles, more than four angles, for example? Where you want to start is completely up to you on questions like this.

Let's see how you got on.

So, only one right angle, only one shape has only got one right angle, and that's F.

Again, it's that right-angled triangle.

What about the next one down there, where it says, "More than four angles?" There's going to be two shapes here with more than four angles: B and E.

That pink shape and that orange shape, if you look carefully, they're not quadrilaterals, they've got more sides and more angles than that.

They've got more than four angles.

Well done if you could see that.

What about the next one then? The same question is on the last slide, "At least one angle greater than a right angle." So it's got at least one obtuse angle.

Three of them there, if you've just got one of them, that's fine, if you got all three, that's brilliant, well done.

All of those three shapes, the purple shape, the pink shape, and the orange shape, have all got obtuse angles.

Well done.

And acute angles? The blue shape, and the purple shape, and the green shape right at the end have all acute angles, so how did you get them? Like I said, for the last ones, if you've just got one, that's great, if you've got all three of them in those boxes you've done really, really well, well done.

You've remembered lots of about that vocabulary.

Let's move on then.

Today we're going to be having a go at drawing some shapes from their description.

So here's a description, "Draw a shape with 2 right angles." Okay, so I'll start with a line, and I want to make a right angle, don't I? A perpendicular angle so that needs to go at right angle for that one.

There we go, I've got one right angle.

The question is I need two right angles, so I need to put another line in to make two right angles.

There we go, I've got two right angles.

And if I need to, I can check them with my right angle checker to make sure that they are that perfect, sharp corner of the square.

And I can see that looks like a square.

Now that's all I need for this shape, but I do need to finish it off, don't I? So I do need to make sure it's a finished shape.

But I don't need to include any more right angles.

So I can do what I need to with the last part of that shape.

And again, like I said, you can check that you've got those right angles there.

And right angles often have those little squares that sit in the corner, that show us it's a right angle.

Okay, are you going to have a go? Here's yours, "Draw a shape with at least one acute angle." Pause here and have a go, one acute angle.

How did you get on, was that easy? When you say, "At least one," you could draw more- it could have more than one acute angle, that's absolutely fine.

So here's lots of shapes that have got one acute angle.

Maybe yours looks like one of these shapes.

Maybe it doesn't look anything like these, that's absolutely fine.

As long as you can use you right angle checker and one of the angles on your shape is smaller than the right angle, that's absolutely fine.

Well done, year three, you're doing some fantastic work here.

Let's move on then, I now need to draw a shape with more than four angles.

And we could see from earlier in the lesson that a shape with more than four angles has more than four sides.

So I'm going to want to draw at least five sides.

And we could also see from those shapes that have more than four angles, they often have obtuse angles all the way through.

If we think about a normal pentagon or hexagon, all of the angles on those shapes are obtuse.

And it doesn't say in this question what we need to make the angles.

We don't need to make them right angles, or acute, or obtuse.

So if I draw my five lines, there we go.

I've managed to draw a shape with more than four angles.

I've got five angles.

Okay, you're going to have another go? "Draw a shape with three sides and one right angle." Pause the video here and have a go.

Three sides and one right angle.

How did you get on? What kind of shape did you draw if you drew a three-sided shape? You hopefully have got a triangle, all three-sided shapes are triangles.

But with a right angle, hopefully you've drawn a right-angled triangle.

So one of the angles, it can only be one, one of the angles is a right angle.

So hopefully your triangle looked like one of these.

These are all right-angled triangles, they're just in different orientations.

Well done, year three.

You're working really, really well today.

Okay, it's your turn now to have a go at the independent activity, but I will just have a quick look at the first one for you.

So for this section, you just need to decide where those shapes go on that table, which box do they fit into.

And just it says there, one shape goes into two of the boxes.

So, pause the video here and have a go at that independent task on your own.

How did you get on with it? Easier questions and harder questions? Let's see how you did, and although it's a little bit tricky, try to pay particular attention if you did make a mistake.

'Cause that's where you're going to do some really, really good learning.

Mistakes are good.

Okay, how did you get on? Which of these shapes has only got one right angle? We've talked about this shape quite a lot today.

It's our old friend, that right-angled triangle.

What about more than four angles, then? Well we know that that hexagon will fit in nicely there.

Is it a hexagon? Yep, six sides, a hexagon.

Okay, and then it says that one shape goes into two of these boxes.

And that's the boxes that say, "Obtuse angle," and "acute angle." Then you're going to write that and go, smaller than a right angle.

And it's that last shape there, the parallelogram, which will meet both of those descriptions.

It's got acute angles and obtuse angles.

How did you get on with that question? Okay, what about this one then, there are some mistakes here.

Two of these shapes don't belong where they are, do you know which ones they are? So, contains one right angle, well we've got that right-angled triangle, so that's good.

But that other shape is a rectangle, that hasn't got only one right angle, it's got four right angles.

So well done if you saw that that one was in the wrong place.

What about more than four angles, then? Let's have a look at those two shapes.

One of them has got more than four angles, but the other one hasn't.

One is a square, and has only got four angles, not more than four angles.

Okay, at least one acute angle, yeah, those both look right to me.

And at least one obtuse angle, that one looks great too.

Well done if you got all of those right.

So you found those two shapes, which were in the wrong place.

Okay how did you get on then at drawing these shapes? Let's have a look.

"A three-sided shape with only acute angles." So we know a three-sided shape is going to be a triangle.

But it needs to be a particular kind of triangle.

We don't want our right-angled triangle anymore, because it says that it only includes acute angles.

So you want to draw a triangle that looks something like this.

And well done if you were able to do that.

And about the other question that this girl's asking, "A quadrilateral with only two right angles." That was quite a tricky one, I kept coming back to this.

But something like this could be great.

So it's a square at the bottom, or a rectangle at the bottom, so it's got its two right angles at the bottom, but the two rectangles that would be at the top have sort of been cut across.

So the top angles aren't right angles, but the bottom angles are.

Yours might not look exactly the same as that, but as long as you've got just two right angles, you're doing really well.

Well done.

What about the questions that the little boy is asking then, "A shape with more than four angles," and we've seen these shapes as we've been going through.

You could have a pentagon, like here, or a hexagon, or you could go up to a many-sided shape.

As long as it's got more sides than a quadrilateral, you're doing really well on that question.

Well done.

And the other one that the boy's asking, "A shape with two acute and two obtuse angles." Again, we've looked at these shapes, so it might be like this, where it's got the two acute angles at the bottom and the two obtuse angles at the top.

Or it might be this shape, which we've seen quite a lot this lesson.

Which is that parallelogram where the acute and obtuse angles are opposite each other.

Well done if you were able to draw either of those for that question.

And did you get on to the challenge? Were you able to describe this shape using that new vocabulary? It's got some parallel lines.

How many pairs of parallel lines does it got? It's got lots of parallel lines, in fact.

It's got the two long ones are parallel, along the middle.

The ones down the side are parallel as well, so it's got two pairs of parallel lines.

It's also got the shorter ones are parallel as well, so they make a pair.

And the shorter one and the longer one at the side make a pair of parallel lines.

You could describe it, not as a quadrilateral, it hasn't got four sides.

But you could describe it as having right angles, how many right angles has it got? Inside it, it's got one, two, three, four, five right angles.

So you could have described it as having five right angles, well done.

And perpendicular lines, as well.

Well done if you were able to use that vocabulary to describe that shape, really good work.

Okay, now's the time to complete the final knowledge quiz, and see how you've got on with today's learning about 2-D shapes.

Fantastic work, see you tomorrow for some more work on shape.

Bye bye, have a wonderful day!.