3D shape

Audio Transcript Auto-generated

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  Hello, everybody.

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  This is the first introductory video on our new topic

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  off three D shape.

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  I thought it be better if I demonstrated on showed

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  you some actual three D shapes to get our heads

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  around their properties.

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  So when we look at three D shape, we don't

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  remember that three D shapes are different to two D

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  two D off two dimensional.

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  Their flat shapes, three D shapes you can hold in

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  your hand, and they have three dimensions we talk about

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  Vertex is that are the same things corners, edges on

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  faces. So let's start with the Cube.

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  So here we are here we have a three D

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  shape called a cube and if you can see all

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  its faces are squares.

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  Okay, so we've got six square faces.

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  We have got four, four and four the 12 edges

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  on. We've got four corners on this side and four

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  corners. Here's we've got eight.

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  Virtus is on a cube here.

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  We have our next shape.

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  So this is what we call a Q.

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  Boyd. I'm sure you remember these.

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  So we've got four rectangular faces and to square faces,

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  so we've got six faces like the Cube We've got

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  four edges on this side.

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  Four edges on this side and four edges along.

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  So it just like the key.

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  We've got 12 edges on.

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  We've got four corners or vertically on this side.

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  Four corners on this side.

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  So just like the cube again, we've got eight.

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  Virtus is now.

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  This is the one we always say.

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  Remember that it looks like a Toblerone.

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  So a prison.

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  I'd like to think of any two D shape that

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  has been pulled outwards.

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  We've got our trying on this side, and then it's

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  like it's being pulled to make a three D shape.

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  And here we've got two triangular faces.

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  Ah, Nde three rectangle, rectangular faces.

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  So, in total, we've got five faces.

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  We've got 123 edges, three edges on this side of

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  three edges on this side.

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  That makes three lots of 3 to 9 edges on.

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  We've got three.

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  Vergis is on this side and three birds on this

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  side making a total off six virtus ease.

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  Now, you could make a prism out of any shape.

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  It all this next one.

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  It's a hexagonal prison.

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  So you might be able Thio.

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  Guess how many edges on each end.

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  It has because it's got the same as a hex

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  again, it's got a hexagon on each side.

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  If you could remember, Hexagon has six sides.

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  So in this way, about six edges here, six edges

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  there and six edges going round one of each of

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  the corners throughout.

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  6 12, 18, 18 edges.

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  We've got one face there, one face there.

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  We've got six rectangular faces coming around, so in total

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  we've got eight.

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  So if anyone spotting the pattern between the number off

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  faces and the number of sides of the two D

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  shape, we've got six sides of the flat two d

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  hexagon and we've got 678 faces on the hexagonal prism.

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  The next one is also a prison, but this time

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  I hope you spot that we've got an octagonal prism.

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  So it's the octagon on each side, and an octagon

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  has got eight.

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  Besides, so this one, we've got eight faces X eight

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  rectangular faces going around two faces on each side, so

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  total off 10 faces.

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  Now we've got 8.

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  30 sees on here and eight virtues is on here.

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  So we've got two lots of eights at 16, Vergis

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  is in total coun tell the money, but eating an

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  ice cream.

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  So there we go.

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  Imagine it that way around.

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  Okay, but we're going to look at it this way,

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  Remember, Shapes got the same properties matter what orientation it's

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  on or how are you holding it?

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  So we've got one circular face on the bottom.

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  Goes up to a point on a curve face or

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  they're about to face is one edge and one vertex

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  one corner.

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  Now pyramids are shapes that our faces, any faces that

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  come to a point.

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  So this one's a square base.

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  Periods gotta square on the bottom, but we can have

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  lots of different types of pyramid.

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  It's gotta square there, and it's got 1234 triangular faces,

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  one off each of the side of the square, so

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  that's five faces in total.

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  One corner on dhe.

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  12345678 Edge is now having to put this one.

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  This is a hexagon, no based pyramid.

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  So you think about it.

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  It's got you six size of a heck skin of

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  six edges here, and then it's got another six.

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  So six and six is 12.

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  Coming from each of those six.

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  Vergis is also comes to a point.

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  Ah, nde.

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  This one here isn't a Sofia.

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  Assume if you like to call in school, it s

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  fear. It's like a ball shape when we say that

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  it's got no Vergis is no corners, no edges and

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  one caved face.

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  So if you look at some of the online games

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  that I put on the Web page on some of

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  the websites, there is one that you can actually manipulate

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  the shapes around it like I've done so You can

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  see the different shapes and you could spin them round

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  so that you can see the edges faces inverted, sees

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  something. It's quite hard to visualize these shapes in your

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  head, so use those online tools when you're doing your

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  work on three D shape this week, See you later