Session 9: Solids

In this session, you will build solids, including Platonic solids, in order to explore some of their properties. By creating and manipulating these solids, you will develop a deeper sense of some of the geometric relationships between them.

For information on required and/or optional materials for this session, see Note 1.

Part A:
Platonic Solids

Part B:
Nets

Part C:
Cross Sections

Homework

In this session, you will do the following:
•	Learn about various aspects of solid geometry
•	Explore Platonic solids and why there is a finite number of them
•	Examine two-dimensional properties of three-dimensional figures such as nets and cross sections


	Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.


	Previously Introduced:		New in This Session:
	congruent regular polygon vertex		cross section edge face net Platonic solid polyhedron

Next > Part A: Platonic Solids

Session 9: Index | Notes | Solutions | Video