It’s a 3D world!


With CAD, you can test the efficiency and safety of your design ... if you can draw it in the first place! A What shapes can you see in the drawing?


B Work it out! 1. Label five of the 3D shapes (a–g) using the information in the sentences. Ÿ A sphere has one face, no edges and no vertices.


Ÿ A cone has two faces, one edge and no vertices.


Ÿ A cylinder has three faces, two edges and no vertices.


Ÿ Cubes and cuboids both have six faces, twelve edges and eight vertices. But in a cube, all the edges are the same length.


2. Complete the descriptions of the other two shapes.


a. A pyramid has five faces, eight edges and .


b. A prism has five faces, . b.


C Ask and answer questions using the prompts. 1. how / faces / prism? 2. how / edges / pyramid?


3. how / vertices / cubes and cuboids?


4. shapes / faces / cubes? 5. shapes / faces / pyramid? 6. shapes / faces / prism?


c.


How many faces does a prism have?


e.


What shapes are the faces of a cube?


D Work in groups. You are inventors. You need a cuboid, a prism and a pyramid for your invention. You can cut it from sheet metal.


1. Study the template for a cuboid. How do you make it?


2. Make a template for a prism and a pyramid. Tip! Practise with pieces of paper.


a cuboid template 91 f. g. vertex d. edge a. face cube


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