Lesson video

Hi, everyone.

I'm Miss Miles.

Welcome back to your year five maths lessons.

To start off, a did you know fact.

Today's fact is, did you know that triangles are often used in construction because of their great strength? Okay.

Back to the maths.

So today's lesson is lesson five in our unit on 2D and 3D shape.

If you haven't completed lessons one to four already, please make sure you do that first.

For today's lesson, you will need a pencil, a piece of paper, and a clear workspace.

And before you start, you need to make sure that you have completed the pre-lesson quiz.

In today's lesson, we are going to be identifying the properties of quadrilaterals.

And when you're ready, we will get started.

On screen now are six different sets of lines.

I would like you to identify which sets are parallel.

Before you do that, a quick reminder, parallel lines are lines that are going in the same direction, are an equal distance apart from one another at any point, and that if they carried on forever and ever, they would never meet.

Pause your video there and identify the sets of parallel lines.

I can see that there are three sets of parallel lines here.

These ones, these ones, and these ones.

I know that those three sets of lines are all parallel because they are an equal distance apart at any point, they would never meet if they continued, and they are all facing the same direction.

Now, reading on, to think about quadrilaterals now.

On screen, there are three questions for you to think about.

What is a quadrilateral? How many quadrilaterals can you name? And can you draw any quadrilaterals? Pause the video there and have a think about that for me.

Okay.

A quadrilateral is a four sided polygon.

It is a 2D shape, and it has four straight sides, and four vertices.

Here are some pictures of some different 2D shapes on your screen.

I would like you to identify which of these shapes are quadrilaterals and which ones are not, and how you know that.

Again, just to remind you, a quadrilateral is a four sided polygon.

It must have four straight sides and four vertices.

I'd like you to pause the video there and identify the quadrilaterals for me.

Okay.

Let's have a look at our answers now.

So, onscreen the shapes that are coloured green are our quadrilaterals because they meet the criteria at the top.

A quadrilateral has four sides and four vertices.

It is two dimensional, closed, and has straight sides.

I know that the triangle is not a quadrilateral because it only has three straight sides and not four.

However, I know that the rectangles on screen are quadrilaterals because they have four straight sides.

They have four vertices, and they are closed shapes.

On screen now are a variety of different shapes.

I would like you to have a look at them all and think about what's the same and what's different.

Pause your video there.

Okay.

Looking at all of these different shapes, I can see that they are all quadrilaterals.

They all have four straight sides.

They have four vertices.

They are two dimensional, and they are all closed shapes.

I can also see that every shape on screen has one set of parallel lines.

I can also see that some of them are different heights.

Some of them are taller.

Some of them are smaller.

Let me show you something now.

On screen, the shapes have now had blue arrows added onto them.

The blue arrows show the lines in the shapes that are parallel to one another.

All of these shapes are trapeziums. And the reason that they are all trapeziums is because of their one set of parallel lines.

Any quadrilateral that you can find with one set of parallel lines is a trapezium.

Okay.

Moving on now.

Have a look at these shapes.

What do you notice about the number of sets of parallel lines in these shapes? Pause your video there and have a look for me.

Okay.

I noticed this time that all of these shapes on screen have two sets of parallel lines.

And I can again, show you the arrows here.

So, on this shape at the top, I can see these lines here, these two arrows here, they show the first set of parallel lines because each side is marked with one arrow.

The other two sides are marked with two arrows to show the second set of parallel lines.

These shapes are all parallelograms. I find it really easy to remember that these are parallelograms because they have two sets of parallel lines.

On screen now, you have got a range of different parallelograms for you to have a look at.

And I would like you to consider what is the same and what is different about them.

Now, I know that some are purple and some are blue, but I would like you to have a think about our shape knowledge that we've looked at.

What's the same and what's different about them? Pause your video there.

Okay.

I can see on screen that my shapes that are purple have two sets of sides that are the same length, opposite sides are the same length.

The ones that face this way are the same length, and the ones that face this way, are the same length.

I can see in my blue shapes, however, that all of the sides are the same length.

These are all still parallelograms. This green parallelogram here that I'm going to show you is similar to the purple ones on screen.

It has opposite sides of the same length.

And this parallelogram here is similar to the blue ones on screen.

It has parallel sides, but it has four sides that are the same length.

These ones with the four sides the same length are special types of parallelogram.

And it's called a rhombus because it has its four sets of sides that are all the same length.

Just like a square is a special type of rectangle.

And we're going to have a look at that now.

So, onscreen now are a variety of rectangles.

A rectangle is a parallelogram with all right angles.

So, I've got one here to show you.

Here's my rectangle.

It, like a parallelogram, has two sets of parallel sides, but instead of having different angles, these ones are all right angles.

And my square has two sets of parallel sides and four right angles.

But it's slightly different to a rectangle in that all sides are the same length.

Time to apply your learning to an independent task now.

On the left hand side, there are a variety of shapes numbered from one to nine.

You need to look at the shapes on screen and you need to put them into the correct boxes on the table to the right hand side.

You need to sort them according to their criteria.

If a shape does not fit any of the criteria, you need to leave it outside.

So, have a look at the criteria.

Have a look at the shapes, and sort them into the correct boxes on the table.

Pause your video there.

Let's go through the answers together now.

The shapes have now been sorted into their correct boxes, and hopefully you have the same answers as me.

If you don't, have a look at what you've done and correct yourself.

Well done for completing today's maths lesson.

Please don't forget the end of lesson quiz.

And hopefully I'll see you again very soon.