- Last time: The sexiest rectangle
(or is it just cute?). Does the golden rectangle appear all over the
place, or is it an illusion, like faces in carpets, or
doggies in clouds?
- Today:
- Hand back homework, sections 3.1 and 3.2
- Collect homework, sections 3.3 and 3.4
- Establish homework assignment from last time....
- Regular polyhedra start with regular polygons -- so what are
those?
- Platonic Solids - time to get out those 3-D glasses!
- Now let's make them in 3-d! We're going to be using our kits (or
the geomags) today to
construct a set of Platonic solids (Problem I.1), and use them
to fill in the table on page 275:
| |
# of Vertices |
Edges |
Faces |
faces at each vertex |
sides at each face |
| Tetrahedron |
|
|
|
|
|
| Cube |
|
|
|
|
|
| Octahedron |
|
|
|
|
|
| Dodecahedron |
|
|
|
|
|
| Icosahedron |
|
|
|
|
|
- If there's time, we'll look at the other problems:
- Next time: 4.7: The Fourth Dimension (ChrisB, KellyG)
Links:
Website maintained by Andy Long.
Comments appreciated.
Updated on 10/13/2004 14:29:37