- Reminders:
- you have an assignment due on Friday: the problem solutions from the last
section (section 4.3) will be handed in.
- Ivars Peterson is coming on Monday! I would like everyone to make a
special effort to be here on Monday, and be lively!
And come to his talk, if you can, for extra credit! (equivalent of a homework assignment). If you can't make the talk, you can earn extra credit by writing a report about one of his articles on the web (two pages, due Monday). They are available from our homepage.
- you have an assignment due on Friday: the problem solutions from the last
section (section 4.3) will be handed in.
- Why the symmetry in the table we put together for the
five Platonic Solids?
# of Vertices Edges Faces faces at each vertex sides at each face Tetrahedron 4 6 4 3 3 Tetrahedron 4 6 4 3 3 Cube 8 12 6 3 4 Octahedron 6 12 8 4 3 Dodecahedron 20 30 12 3 5 Icosahedron 12 30 20 5 3 - We're going to be using our kits today to construct a set of
Platonic solids (Problem I.1). If you don't have your kit, or would prefer to
use paper, I have a handout you can use, from this site.
Don't forget to add flaps, so that you can glue!
- If there's time, we'll look at the other problems:
- I.2
- I.3
- II.1
- II.2