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3. Purchases Making Purchases Special Offer: Every time you buy 4 or more presentations (in a single basket) the cheapest will be free. Buy 8  get 2 free, buy 12  get 3 free etc. You will be able to monitor the discount as you place the presentations in your basket. Your purchased presentations will appear in your account instantly. Please note that when paying by credit card you must press the “RETURN TO MERCHANT” button on the final PayPal screen showing your receipt for payment. If this button is not pressed then you will experience a delay in the presentations being placed in your account. Further Information FREE MONTHLY PRESENTATION: A free presentation will be added to your account at some point during each calendar month. HOME PAGE: More free stuff/sample material at bottom of page. ORDER FORMS: Catalogues can also be found here showing some screen shots. Hints and Tips Printable Worksheets: Always choose “Slide Outline” (top left) before running a presentation to view slide titles and to check for printable worksheets. Editing Presentations: All presentations are normally quite easy to edit (particularly text). It is also straightforward to insert your own slides.

4. Faces, Edges and Vertices Three dimensional (3D) shapes are defined by the number of faces, edges and vertices (corners) that they have. VERTEX (plural is vertices) EDGE TETRAHEDRON FACE

5. TETRAHEDRON A tetrahedron is a pyramid with triangular faces. Faces Edges Vertices 4 6 4 A tetrahedron is the simplest of all the 3D shapes. Faces, Edges and Vertices Three dimensional (3D) shapes are defined by the number of faces, edges and vertices (corners) that they have.

6. A square based pyramid has: A square based pyramid Faces Edges Vertices 5 8 5 Faces, Edges and Vertices

7. 1 3 2 Find the number of faces, edges and vertices for each of the 3D shapes shown below. Pentagonal based pyramid Pentagonal based prism Cuboid Faces Edges Vertices 6 10 6 Faces Edges Vertices Faces Edges Vertices 7 15 10 6 12 8

8. 4 6 5 Find the number of faces, edges and vertices for each of the 3D shapes shown below. Cube Hexagonal based pyramid Hexagonal based prism Faces Edges Vertices 6 12 8 Faces Edges Vertices Faces Edges Vertices 7 12 7 8 18 12

9. 1 3 2 Find the number of faces, edges and vertices for each of the 3D shapes shown below. Pentagonal based pyramid Pentagonal based prism Cuboid Faces Edges Vertices Faces Edges Vertices Faces Edges Vertices Worksheet

10. 4 6 5 Find the number of faces, edges and vertices for each of the 3D shapes shown below. Cube Hexagonal based pyramid Hexagonal based prism Faces Edges Vertices Faces Edges Vertices Faces Edges Vertices Worksheet