17. How many a) faces b) edges and c) vertices does a tetrahedron have? Is a tetrahedron a regular polyhedron? Explain your answer.


18. a) Look at this net. Apart from looking like a robot’s head, what 3-D shape do you think it makes?


b) Copy it onto a piece of paper, cut it out and assemble it. c) Is it a polyhedron? Explain your answer.


19. True or false? a) A cube has 8 edges. b) A cuboid is a regular polyhedron. c) A pyramid has 5 faces. d) A triangular prism is a regular polyhedron. e) A tetrahedron has 6 edges. f) An octagonal prism has 10 faces. g) A sphere is not a polyhedron. h) A cylinder is a prism.


20. With the 3-D shapes that you have assembled, construct an unusual building or cityscape. Work with the people who are near you.


Homework 1. See if you can fi nd examples of the following 3-D shapes in your house. a) cube


d) cylinder b)


b) sphere e) cone


2. Name the following 3-D shapes from their nets. a)


c)


c) cuboid f) pyramid


d)


162 3-D Shapes


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