Tick 3 properties which describe this shape...

Which 3-D shape contains only 2 triangle faces?

All of these shapes have lines of symmetry, true or false?

What shape am I? I am a 3-D shape with 6 square-shaped faces?

To revise shapes

Key Stage 2

Maths

Angles and shape

True or false - this line shows symmetry?

How many lines of symmetry does this shape have?

Which of these shapes has one line of symmetry?

﻿Hello again, your Miss Brinkworth here. How are you today? This week, I've been trying to get us to focus a little bit on the things that we can do a little bit more of, maybe walking, talking to your friends. I'm getting used to doing video calls, I don't know about you. I'm also eating a little bit too much chocolate, but I wonder if you can remember the name of the shape that my chocolate comes in, and it's definitely a 3-D shape, because it's solid, and I can hold it, and move it, and touch it. It has two circle faces, and it has three rectangle faces. What is this shape called? Can you remember? It is a triangular prism. I'm going to talk about this a little bit later, because today's lesson is a revision lesson. We're going to be pulling together all of the learning about shape from your lessons with myself and Mr. Etherton this week. So, you just need your pen or pencil, and something to write on. Here are star words. Most of them should be familiar to you, if not all of them, in fact, but if there are a few you're a little bit shaky about, don't worry. We're going to be looking at them in detail again today. So, I'll say them, and if you could say them back, that'd be great. We've got symmetry, 2-D shapes, 3-D shapes, faces, lines, vertices, corners, angles. Just have a look at those. Think about which ones you feel very confident with. Maybe you could describe what they mean to somebody who hadn't heard of them before. Maybe there are ones you're not feeling quite so confident with. When we get to those words in the lesson today, make sure you pay particular attention, so that we're really getting to grips with this new vocabulary. Okay, so here's a nice warm-up to get you thinking about maths, and getting you thinking about shape. You just need to decide whether these statements are always, sometimes, or never true. So, we have a square is a 3-D shape, rectangles have four right angles, triangles can have a line of symmetry, and a cylinder has two circle faces. Pause the video, and decide whether those statements are sometimes, always, or never true. How did you get on? I wonder whether you found some easier than others, if there's answers you're really confident with, and ones that you're not quite so confident with. Let's see how you did. A square is a 3-D shape. No, a square is never a 3-D shape. It is a 2-D shape. It's flat. What about rectangles have four right angles? Rectangles have four right angles. They always do. If you are looking at a shape that doesn't have four right angles, it's not a rectangle. How about triangles can have a line of symmetry? And that's a bit of a trickier one. We've looked at triangles this week that do have lines of symmetry, but they don't all, so that means that that is, it's sometimes true. And what about a cylinder? Does a cylinder have two circle faces? Remember, a cylinder, like a tin of beans, or soup. It has got two circle faces, so well done, if you remembered that that statement is always true. Okay, let's move on then, and have a look at this revision. So, starting with 2-D shapes, here's the vocabulary that we use when we're talking about 2-D shapes. So, the lines that make up the 2-D shape are called sides, so you can see that that square there has got four sides. Where those sides meet, those are called a vertex. If we have more than one of them, they're called vertices. So, you can see that that square has got four sides, and it's got those four vertices as well, and again, that green triangle, we know that triangles have three sides, and that means it's also got those three vertices. So, that's the correct vocabulary when we're talking about 2-D shapes. Can you use that vocabulary and have a go at this question? So, you just need to match up the picture with the description, the 2-D shape with the description of the 2-D shape, and remember, it doesn't matter what order you want to do that matching up in, as long as you get them all matched up. Pause and have a go. Okay, how did you do? Remember, it doesn't matter the order you do them in, so if there are ones you feel really confident with, it's good to get those answered first, and then that leaves less options for the ones that you're maybe not quite so sure about. So, maybe you're very competent with squares, and you know the description of squares. I hope so, 'cause we spent a whole lesson on squares and rectangles this week, but let's see which of those descriptions matches a square. Well, we know that squares have right angles and equal sides, so well done if you were able to see that that's the correct description for that one. The next shape is a circle, and it's unique out of those four shapes, because it's the only one with a curved side, so that's a nice, easy one to match up next as well. We're then left with those two shapes and those two descriptions. One says that it's got six obtuse angles, and one says that it's got three straight sides. Looking at that purple shape, it's got six sides, six, six has got an X, it's a hexagon, six. Oh, six sides and six angles. Are they obtuse? Yes, they're all bigger than a right angle, aren't they, so that description matches up there. That then leaves us with that last shape, and that last description. Let's check that they do match before we just draw the line in. So, we've got a triangle there at the bottom, haven't we? A green triangle, and it says three straight sides. That looks correct to me, so well done if you got all of those description matched to those 2-D shapes perfectly, well done. Okay, quadrilaterals and rectangles then. Can you look at these shapes and find four quadrilaterals? Out of those four quadrilaterals, two of them will be rectangles, so find four quadrilaterals, and then the two rectangles. Pause the video here and have a go. How did you do? Hopefully this wasn't too hard. Hopefully you remembered the quad, like a quad bike has got four wheels. A quadrilateral has got four sides. Which ones of these shapes have got four sides? It's these four here, and well done, if you were able to see that. Now, which of those four shapes are rectangles? And really good work if you remembered that squares are special kinds of rectangles, so those are our two rectangles. Now, what is it that makes those two rectangles? How are they different to the other quadrilaterals? They've got four sides, but what makes them different is their right angles. Their lines meeting at a right angle, those perpendicular pairs of lines, is what makes them rectangles and squares, and those other quadrilaterals don't have four right angles. Those are rectangles that have those, so well done if you could see that. Okay, let's move on. Symmetry, now we can see here that these shapes have got a line of symmetry drawn on, and that's where, if you remember, we can fold a shape up, and it will sit perfectly over the other side. It won't be bigger or smaller. It won't be a different shape. We can fold it perfectly, and it can match. Fold it out, and they look identical on either side. So, using that, can you decide which of these shapes at the top here, these green ones, have symmetry? Which ones are symmetrical? Can you see? Well done if you can see that it's this one. So, it's a bit of a common mistake people make with symmetry, that they think it's sort of the same picture next to each other, like you can see in that second one, but what you need to remember is it's like a mirror image, one that unfolds, and has got the same picture each side. What about the bottom there, then, that rectangle? That rectangle has been split up three different ways. Some of the ways it's been split up is with a line of symmetry, so that if I folded that rectangle over that line of symmetry, it would fit perfectly into the other side. Can you see which ones are symmetry, and which ones aren't? That one's symmetrical, and that one's symmetrical, but the last one with the diagonal line is not. That rectangle would not fold perfectly over into that other half. Okay, moving on to 3-D shapes then, and we've got some other vocabulary here. We've got edge, vertex, and face. So, if you remember, when we're looking at 3-D shapes, they are solid shapes that we can hold, move, rotate, and the shape that you can see there is a cube, like my one. So, the edge are these lines. The face is the flat or curved surfaces, so these ones on this cube are squares, and the vertex are where the edges meet, and again, like on 2-D shapes, if we have more than one vertex, they are vertices. So, what has this cube got? What shape are the faces? I just mentioned that they are squares. It's got square-shaped faces. That's what makes it a cube. It only has square-shaped faces. How many faces does it have? Well, it's got one, two, three, four around the edge, and then one at the front, and one at the back, so four and two, it's got six faces. What about the vertices then? What about those corners? Well, it's got four at the top, and four at the bottom, so it has got eight vertices. Four at the top, and four at the bottom. What about the edges then? How many edges has it got? Again, it's got four at the top, and four at the bottom. It's also got the four that link those up in the middle, so it's got four and four and four. Can you remember? It's got 12 edges. Well done if you got that. Okay, can you use that vocabulary, then, to have a go at this fun task where you need to link the representation of the 3-D shape with its description? Again, start wherever you like, whichever ones you feel most confident with, and have a go at thinking, where are those lines going to appear which match the representation of the 3-D shape and its description? Pause the video, and have a go. How did you get on? Were some easier than others? So, what normally happens with 3-D shapes is they're ones that we're used to seeing quite regularly, like cubes, maybe cylinders, so we get quite confident knowing the properties of those ones, and then there's some slightly more unusual ones, which we don't see quite so often, and so remembering the properties of those can be a bit trickier, but with questions like this, it doesn't matter which order you decide to answer the question in, so you can always answer the ones you're most confident with first, and then you'll have less options left for those ones that are a little bit trickier. So, if we go through these together, two triangle faces. Well, we're coming back here to my chocolate obsession with two triangle faces. Which of those shapes has got two triangle faces? It's this one, which is a triangular prism. Well done if you got that one right. What about four triangle faces then? What kind of shape has four triangle faces? Well, it's this shape here, and it's got a square at the bottom, it's squared-based. Off each side of that square comes a triangle, so it's got four triangle faces. So, well done if you were able to match that one up to the correct picture. Can you remember what that one's called? I gave you a little bit of a clue. It's a square-based pyramid. Well done if you could see that. Let's have a look at the next one, then, only square faces. Well, again, we just looked at that shape. It's this cube. It has only got square faces. So, well done if you were able to match that one up properly. One circle face, just one circle face. Well, we're getting towards summer, you might want an ice cream in one of these things. It's a cone with just one circle face, a cone. So, well done if you could match that up to the correct picture, and then that leaves the last one with the two circle faces, which has already appeared in today's lesson. Two circle faces. It's that image there, which is of a cylinder, so well done if you were able to see all of those ones correctly, really good. Okay, now's the time for you to do your independent work on revising shape, so pause the video here, and have a go at doing that by yourself. How did you get on? Shall we have a look at the answers together? So, for this first shape, first question, it says, which of these are 2-D and which are 3-D? Now, we need to remember that these are pictures of 3-D shapes. They're not really 3-D shapes, 'cause you can't hold them, but they are pictures of 3-D shapes, so how did you get on here? So, we've got 3-D, 3-D, 3-D, 3-D, and 3-D. Hopefully you can see those quite clearly, and that obviously means that the other ones are 2-D. A challenge, then, how many of them could you name? We've talked a little bit about the names today. For those 3-D shapes, we've got a cuboid, which is the shape right down in the bottom-right, so that one that's got rectangles. We've got a sphere, that green shape. We've got a square-based pyramid, that one right in the middle with the grey bottom. That's your square-based pyramid, and we've got a cuboid as well. So, what about the 2-D shapes? Well, you can see that one's got five sides. That makes it a pentagon. We've got a triangle, and it's a triangle with a right angle, so it's a right-angle triangle, and there's a rhombus. Really good if you knew rhombus, 'cause I don't think we've covered that this week. Okay, true or false then? 2-D shapes can only have straight lines. 2-D shapes can only have straight lines. That one is false. We know about circles have curved lines. We've talked about that this lesson. Squares and rectangles have the same lines of symmetry. That's false, squares have more lines of symmetry than rectangles. A cone is a 2-D shape. I can hold it. It's solid. It's not a 2-D shape, it's a 3-D shape. So, well done if you could see that there. That one's false, that last question. Well done, okay, let's look at part B. What is the difference between a cube and a cuboid? And there's pictures there to help you. Can you see the difference? They have a lot of similarities. They've got those, they've got the same number of faces, and they've got the same number of edges. They've got the same number of vertices, so that's what's the same, but what's different? So, hopefully you can see from that picture that the cubes have only square faces. They all have rectangles, but cubes have squares, and cuboids can have other rectangles. Which 3-D shape has only one circle face? Well, we've talked about this one a little bit this lesson already. Just the one circle face on a cone. So, well done if you got that one right. Which 3-D shape is a quadrilateral with four right angles and four equal sides? There's only one shape that that can be. Well done if you knew that was a square. Okay, and if you drew a shape with three sides, hopefully you've managed to draw a triangle, and there's lots and lots of different ways of drawing triangles. So, you can have a right-angle triangle, you can have an equilateral triangle, and well done if you drew lots of different kinds of triangles, that's fantastic. All right, pause the video here, and have a go at that Final Knowledge Quiz to see how much has sunk from today's lesson. Really good work today, and for the whole week. Lots of new vocabulary and new concepts. You've worked brilliantly, well done. Have a fantastic day, bye-bye.

To revise shapes

To revise shapes

Slide deck

Lesson details

Key learning points

Licence

Video

Worksheet

Starter quiz

4 Questions

Exit quiz

5 Questions

Lesson appears in

UnitMaths / Angles and shape

Maths