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 Challenge
 Octahedron:  A regular polyhedron whose eight faces are congruent equilateral triangles.

Faces, Vertices, and Edges: Find a relationship between the number of edges, faces, and vertices in three-dimensional objects.

Octahedron in a Cube: Determine the probability that a point lies in a particular area.

Creating a Polyhedron: Determine the properties of Polyhedra.

Changing Cubes II: Explore the effect that changing the surface area and volume of a cube has on the dimensions of the cube.

Volume and Surface Area of a Cube: Explore what happens when you add ratios.