Lesson video

Hi, everyone.

How are you? I'm Miss Mitchell, and today in math, we are going to be consolidating and reviewing everything that we've learned in the shape topic.

In today's lesson, we will be consolidating and reviewing everything that has been taught in the topic.

You will then complete a quiz.

For today's lesson, you will need a pencil and some paper.

Pause the video now to get this if you have not got it already.

The first thing I would like you to do, I would like you to tell me what these two shapes are.

So could you pause the video and tell me what these 2D shapes are? How do you know? Well done and here are the answers.

So the first shape is a heptagon and we know it's a heptagon because it has seven sides and seven vertices.

A vertice is like a corner here.

And my third shape is called a parallelogram.

Now a parallelogram is a type of quadrilateral and this parallelogram, or all parallelograms, have four sides and four vertices, and the two opposite sides are the same.

Okay, your next task is to label, where is an edge on this 3D shape? Where is a vertice, and where is a face? Could you pause the video now to do this? Okay, so an edge, so if you pointed to anywhere along here, this is the edge.

A vertice is a corner.

So any corners that you pointed to is a vertice, and a face are these flat sections here.

Well done.

Now, the next thing I would like you to do, I would like you to tell me, what are the names of these 3D shapes and how do you know? Can you tell me any of the properties about these 3D shapes? Pause the video now.

The first shape is called a cone.

Now, a cone has a circular base and it also has an apex.

Now, the apex is this point up here.

My next shape is called a cuboid.

Now, a cuboid has 12 edges, eight corners, and six faces.

Now, a cuboid is similar to a cube, except in a cube, all the edges are the same length.

However, in a cuboid, only the opposite sides are the same length.

Otherwise, apart from that, all the properties are the same.

My next shape is a triangular base pyramid.

Now, this is a triangle base because at the bottom you can see a triangle.

So that's why it's a triangular base pyramid.

It has four faces, it has four vertices, and it has six edges.

My final shape is a cylinder.

Now, a cylinder has two circular faces.

It has one curved surface but it has no vertices.

It has no corners.

What I would like you to do, I would like you to write down a definition for a right angle.

What is a right angle? A right angle is an angle of 90 degrees.

It is always the corner of a square or a rectangle.

So a right angle is any angle that is 90 degrees.

Here are five shapes.

Can you identify which shapes have right angles? Which of these shapes have angles that are 90 degrees? Could you pause the video now to tell me? And here are the answers.

As you can see on a rectangle and a square, they both have four right angles.

So all of these angles here are 90 degrees, and do you see how you can make a square? That shows it's 90 degrees.

However, this triangle, this heptagon, and this trapezium don't have any right angles, which means none of their angles are 90 degrees.

We are now moving on to the word symmetrical.

Could you pause the video and write a definition for the word symmetrical? How do you know something is symmetrical? Symmetrical, something is symmetrical when it is the same on both sides, when it is identical.

A shape has symmetry if a central dividing line, so like a mirror line, can be drawn on it to show that both sides of the shape are exactly the same.

So if you could draw a line on it and both sides are identical, it has a line of symmetry.

Here is a square.

Does a square have a line of symmetry? If so, how many lines of symmetry? Can you pause the video now to show me? A square has four lines of symmetry.

It has one down the middle, one going to the other side down the middle, and then two diagonally.

So that is four lines of symmetry.

Does a rectangle have a line of symmetry? If so, how many lines of symmetry? Can you pause the video now and draw this for me? A rectangle has two lines of symmetry, as you can see here.

Does a pentagon, does this pentagon have a line of symmetry? Because we know not all pentagons look the same.

Some are regular, some are irregular.

This is a regular pentagon, which means all the lengths are the same size.

Does this pentagon have a line of symmetry? If so, how many? And here is the answer.

This pentagon has five lines of symmetry, as you can see on the picture here.

Each line of symmetry goes from one of the vertices down to the middle of the opposite line.

Here, I have a pattern.

Could you pause the video and tell me what comes next in the pattern? And here is the answer.

It is an arrow pointing to three o'clock on a clock.

I know this because if you look at another down arrow, for example here, you know the following one is this arrow pointed to three o'clock.

So it is a repeating pattern, right, up, down, right, up, down, right.

So then I know the one after would be up, followed by an arrow facing down.

It is the same picture that keeps recurring.

Could you please describe the turns for this pattern? So what direction and by what amount of turn has this semicircle turned? Pause the video now to work this out.

This semicircle has turned a quarter turn clockwise.

It was facing nine o'clock, then it faces 12 o'clock, three o'clock, six o'clock.

So each point has turned one quarter clockwise.

What would be after this shape if it was a repeating pattern? It would go back to the beginning to be another quarter turn.

And here is my final question.

Is Rosie correct? Can you explain your answer? A quarter turn clockwise is the same as a three-quarter turn anticlockwise.

Could you pause the video and explain to me whether she is correct? Well done for writing your answer.

Is Rosie correct? Yes, she is.

How do you know that? Well, in my explanation, I would say if Rosie was facing 12 o'clock and she did a quarter turn clockwise, she would be facing three o'clock.

Then if Rosie started at 12 o'clock and she did a three-quarter turn anticlockwise, she would be facing three o'clock.

So that shows they are the same.

If your answer is similar to mine, well done.

If you're not sure, maybe ask a parent or carer to check if you are able to.

Well done, we've consolidated a lot of learning today.

If you would like to share your work with Oak National, please ask your parent or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak.

Why not try one more time to consolidate your learning by completing the quiz? Take care.

Bye.