4. Make a polyhedron with squares. What is its common name? Open it up to lay flat by disconnecting some edges. Use dot paper to draw a diagram of this net.
5. Some polyhedra are called regular polyhedra. The polyhedron you made in #4 is an example of one. Use it to write a definition of a regular polyhedron.
6. Make the polyhedra whose nets are shown below. Which are regular polyhedra by your definition?

7. Based on the class discussion about the above polyhedra, write a new definition of a regular polyhedron.
8. Is a regular polyhedron possible using hexagons? Try to create one and explain why it is impossible.
9. If pentagons are used to make a regular polyhedron, how many must meet at each vertex? Explain. Try to make a regular polyhedron using pentagons. Draw a net for your result.