A 3-D shape that has been opened up like so is called a net.
15. Look at these possible nets for a cube. Which ones can be assembled into cubes and which ones cannot?
a) b) c)
d)
e)
16. Study these nets and suggest what shapes they are. a)
b)
A 3-D shape where every face is fl at and of the same size and shape is called a regular polyhedron. Can you think of any 3-D shape that could be called a regular polyhedron?
A shape made up completely of equilateral triangles is called a tetrahedron. Copy this net of a tetrahedron onto a piece of paper. Then cut it out and assemble it.