Envelope Tetrahedron

A tetrahedron is a 3-D geometrical figure with four faces. It yields the smallest volume for its surface area. A tetrahedron is one of the Platonic Solids.

Turn a small envelope into a triangular pyramid

Tetrahedron activity
Printable instructions

Simple Q's

Count the sides
Count the corners
Count the edges

Trace sides to show    they are the same    size/shape

Moderate Q's

Congruent angles,    edges, faces
Count the vertices
Triangular base

Complex Q's

Find the surface    area
Find the volume

Explore other    polyhedrons

Other links:
Java applet
Interactive java applet
Platonic solids
Other polyhedrons
Make a tetrahedron from toothpicks & gumdrops
Make a tetrahedron from straws & string
Make a colored paper tetrahedron