What you need to know

3D shapes have length, width and depth. All objects you can touch in the real word are technically 3D. There are a few 3D shapes you’ll see much more frequently than others, and their names are important! They’re listed below.

A quick note on some vocabulary of 3D shapes:

3d shapes
3d shapes
3d shapes

A quick note on some vocabulary of 3D shapes:

1. Vertices – a vertex is a corner of the shape.

2. Edges – the straight and curved lines that form the shape are edges.

3. Faces – the 2D shapes on the outsides of the 3D shapes (e.g. the 6 squares on the outside of a cube) are called faces.

Some of these shapes you’ll naturally be more familiar with than others. Try and get them stuck in your head as best you can and then test yourself with the questions below.

Note: drawing 3D shapes is hard but something you occasionally have to do! There’s no specific

3D Shape Questions

A cuboid has all right-angles, and as a result every single face is a rectangle. There can be lots of different kinds of cuboids, and therefore lots of different correct answers to this question. Two examples of cuboids are shown below.

 

 

Drawing 3D shapes is tricky, as mentioned. If you didn’t get this quite right, have a think about these two cuboids and try to work out what makes them correct.

a) This is a square-based pyramid. And don’t forget “square-based”, it’s important! Pyramids can have all kinds of different shaped bases. A tetrahedron might also be called a “triangle-based pyramid”, for example.

 

*If you said rectangle-based pyramid, because you were unsure whether the base in the picture is a square, this is also accepted.

 

b) The circular base and single sharp vertex mean: this is a cone. 

 

c) The two identical circular ends mean: this is a cylinder.

Firstly, let’s recall what a triangular prism looks like.

 

 

So, it has two triangular faces – one on the front and one at the back.

 

Then, we have to consider the faces going around the middle of the shape. Looking, we can see that there are three rectangular faces.

 

Therefore, the total number of faces on a triangular prism is

 

2+3=5.

Revision and Worksheets

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