Lesson video

Hi there so today's lesson we're going to be introducing to quadrilateral shapes.

And then we're going to be comparing and looking at the size of quadrilateral shapes.

When we've done that, we're going to be sorting out some shapes into some Venn diagrams. And then of course, at the end of the lesson, you will have the opportunity to complete a quiz.

So let's start.

Okay, for this lesson, you will need a pencil something to write on and a ruler.

So if you want to run get those things and we can start.

Okay, in front of you are some shapes and we'd have to think what's the same and what's different about these shapes.

You've got five shapes in front of you.

So what's the same first of all? What's the same? Okay, once you've had to think about what's the same, what's different about these shapes? Why are they different? So there are some similarities, some things that are the same between these shapes.

And there are also some differences, some things that are different between these shapes.

Let's have a look together.

So what's the same first of all, all of them are quadrilateral shapes, why they quadrilaterals? Because all of them if you counted the sides for the shapes, they've all got four shape, four sides, sorry.

So all of the shapes in front of us are four sided shapes.

And the name for four sided shape is a quadrilateral well done if you said that.

Okay, what else the same, they are all two dimensional shapes or they are all 2D shapes well done if you said that and all the sides have grey of course.

So we can say they are all they are all 2D shapes.

They're all quadrilaterals.

They have four vertices, they have four straight sides.

So well done if you said any of those things.

Okay, let's look at what's different then.

What's different between these shapes? Two of these shapes have got right angles.

Can you see that? So the two shapes with the green ticks have actually got right angles.

So the other shapes have right angles.

They don't have right angles.

Two of these shapes have got equal sides.

What do we mean by an equal side? So the two shapes that are ticked, if I was to measure with a ruler, the sides if I was to measure with a ruler, the sides of these shapes, they would all measure the same so example if it had a five centimetres, be five centimetres, five centimetres, five centimetres all be the same.

Okay, what else two of these shapes have equal sides? Let's have a look about equal and non-equal sides.

So in front of your two shapes, a rectangle and a parallelogram can you say the word parallelogram? Parallelogram well done so the measurements of the shapes of there, are these shapes equal, do they have equal sides or non-equal sides? What do you think? Do this if they have equal sides or show me this if they have non-equal sides and show me your thumbs in 321 show me.

Okay the shapes do not have equal sides.

They have non-equal sides well done.

Let's have a look at another example.

Okay, we've got a square, and we have a rhombus, and we've got the measurements.

So, equal sides, or non-equal sides.

So equal sides are non-equal sides, show me in three two one, show me.

Equal sides well done if you said equal sides good.

You can see the measurements are all the same.

And this is true for all squares so all squares have equal sides.

And also, all rhombuses have equal sides.

Okay, let's have a look at a regular shape.

A regular shape must have equal lengths and equal angles.

So let's think about that.

A regular shape if a shape is regular, the lengths the measurement around the shape files to measure the size of the shape with my ruler, they would all measure the same not just the sides though.

Excuse me, sorry, the angles as well.

If I was to measure it with a protractor, the angles all four angles would be the same.

A rhombus is not a regular shape, but it does have equal sides.

So why is it not a regular shape? Because the angles are not equal.

A rhombus angles are different they don't all equal the same thing.

It does have equal sides but it does not have equal angles.

I want you to tell me in five seconds, why is a rhombus, not a regular shape? Go.

Okay, well done.

Even though the sides of the rhombus are equal, the angles are not equal.

Okay, so let's have a look then at a regular quadrilateral, if a four sided shape has four sides where if I measured it, they would all be the same.

And if I measured with a protractor, the angles they would all be the same.

What is that regular shape? It is, of course, a square.

So we would call a regular quadrilateral a square.

The only quadrilateral shape that is regular is called a square.

Because a square has four equal angles, and four equal sides, good.

Okay, let's have a look at the Venn diagram.

What's the title of this Venn diagram? Quadrilaterals because that's what our lessons are.

Okay now, we have got some shapes that we need to sort on to this Venn diagram.

But we do have a bit of a problem.

Just the Venn diagram have any other labels it doesn't.

We better add some labels.

So the first label says 90 degree angles.

So if any of these shapes have a 90 degree angle, we will pop it in that circle that says 90 degrees.

And if it has an equal side, we would then pop it into that circle that says equal sides.

But what happens if it has both 90 degree angle and equal sides? You would put it in that middle section and if neither, we would take out of the circles.

Okay, so you've got a rectangle, a square, a triangle and a parallelogram.

When do you think the rectangle will go and why does a rectangle have 90 degree angles? It does have 90 degree angles good.

Does a rectangle have equal sides, only two of the sides are equal.

But all four sides are not equal.

So when we say equal sides, it means all of the sides are equal, not just two of them.

So we put that rectangle there.

What about square? Point to where you think the square would go? Okay, let's see if you're right.

A square has four equal sides, and it definitely has 90 degree angles.

So well done if you've got that right.

Next one's a bit tricky triangle.

Why is it tricky? Is a triangle quadrilateral shape it is not a quadrilateral shape.

So let's keep that outside of our Venn diagram because we're only focusing on quadrilateral shapes.

Okay, and then the last shape to sort is a parallelogram have a go at saying that word again parallelogram.

So where will the parallelogram go? Does it have 90 degree angles? Does it have equal sides? But is it still a quadrilateral? It is still a quadrilateral yes.

Hopefully you got those correct.

Okay, let's have a look at parallelograms. I want you to have a go at saying that word again.

Sometimes it's a bit of a mouthful parallelogram.

Okay, good.

So, there are two examples of parallelograms in front of you.

And they both have different measurements.

Now, I am going to describe parallelograms to you.

I'm going to tell you about the characteristics of parallelograms of any parallelograms. So a parallelogram has four sides, of course it's a quadrilateral.

A parallelogram has four vertices.

A parallelogram is an irregular shape.

Why is a parallelogram an irregular shape? Tell me why? Because the sides and the angles of a parallelogram are not equal, well done okay.

A parallelogram has two acute angles.

It's an acute angle smaller than 90 degrees.

A parallelogram has two obtuse angles, which is obtuse angle larger than 90 degrees.

And of course, the parallelogram the clue is in the name.

It has two sets of parallel sides.

So I've told you about a parallelogram.

Now I want you to do the same about a rhombus.

But notice how I didn't write rhombus.

I wrote rhombi do you know why? We talked about one of the shapes it will be a rhombus, but because I drew two of them, so two or more when there's lots of them, we actually call it rhombi not rhombus.

That's why okay, What can you tell me about a rhombus? Write down as many things as you can so I told you about a parallelogram.

You have a go and tell me as many different features characteristics about a rhombus go.

Okay, let's see how many you got just stop there and let's see how many you got.

So a rhombus has four sides.

A rhombus has four vertices of course remember a rhombus is a quadrilateral shape.

A rhombus has equal sides.

Remember we were comparing it to a square before all of the sides are equal in a rhombus.

A rhombus has two acute angles and two obtuse angles, and a rhombus has two pairs of parallel sides.

How many did you get those points? Well done okay.

Now, this person is saying a square and a rhombus are similar shapes.

Explain why they are similar in some ways.

Obviously a square is a square, a rhombus is a rhombus, but there are some similarities between them what's the same between a square and a rhombus have a think? What's the same between a square and a rhombus? Okay, they both have equal sides.

So obviously they are both quadrilateral shapes.

They both have four straight sides.

They both have four vertices.

They are both quadrilateral 2D shapes and something else they have in common is that all of the sides again, I got my ruler out, all of the sides are equal in measurement, not the angles, just the sides.

Well done if you said that, okay, they also have two pairs of parallel lines, parallel lines they never meet, they wouldn't touch.

But there are some differences.

Quickly tell me about 10 seconds.

What are the differences between a square and a rhombus go.

And stop right, let's have a look.

The angles of course are very different.

A square has four right angles of course and a square has irregular shapes, all the angles are the same.

But a rhombus has two acute and two obtuse angles, all the angles on a rhombus are not the same, not like the square.

And these are the angles.

Okay, well done.

Hopefully you didn't find that too difficult.

And I would like you to now pause the video, have a go at completing the independent task.

Once you've checked for your answers, and you're happy with them, then carry on and play the video again, and we'll go through the answers together.

Okay, welcome back.

Hopefully that was okay for you wasn't too difficult.

So let's have a look at the answers.

So up to the top.

So, for the first task, it was a matching task.

So you had some shapes, quadrilateral shapes, of course and the names of the shapes and the first one was trapezium.

So the trapezium was drawn for you, that was matched up.

And then we've got parallelogram or a rectangle, a square and a rhombus to find.

So let's see.

It's a parallelogram give it a nice little big tick, if you've got that right.

Rectangle, of course, the square the only regular quadrilateral shape.

And then the rhombus, which has equal sides, but not equal angles.

So that was the first task.

Well, done give yourself a really big tick if you got that right.

And then for the second task, I asked you to draw a robot now, this is my robot.

Don't laugh at it I think it's a very good robot.

This is my robot now your robot I'm going to move myself out of the way.

Okay, we have to make sure that the head of the robot it had a rhombus shaped head basically.

So hopefully what I want you to do now is take your ruler to check.

And I want you to measure the sides of the rhombuses of the robots head, the rhombus shaped head of the robot.

And I want you to measure it doesn't matter what it measures to as long as all of the sides of the rhombus are the same length.

Okay, so does the width equal the length, and once you've measured the rhombuses head, then I want you to do the same with the square eyes, okay.

And then measure the square eyes again does the width equal the length and then the parallelograms you can just measure the two sides, the two parallel sides measure the same and the other two parallel sides measure the same as well.

Okay.

Now I actually named my robot I called him rhombo because I figured he has a rhombus shaped head.

So let's go with the word rhombo.

I want to know what did you name your robot? Maybe you came up with the same name as me, who knows? Okay, now, we would really like you here at Oak National to share your work.

So if you would like to share your work with us, I really want to see the robots that you designed and came up with.

And don't forget to add a name of the robot as well.

But please do ask your parent or your carer, to share your work on Twitter, make sure to tag @OakNational and to use the #LearnwithOak.

That's the end of our lesson now.

So I just want to say a really, really big well done on all the successful brilliant learning that you have done today.

And I've just asked you to go and complete the quiz and good luck with that.