This is a simple way to make a tetrahedron (a pyramid) from a small envelope. All you need is a small envelope, a ruler, a pencil, and scissors.

Estimated Time: 15 minutes
Supplies Needed:
  • Small envelope (a business-sized envelope will NOT work)
  • Pencil
  • Ruler
  • Scissors

Instructions

1.

Open the flap of a small envelope. Using a ruler and a pencil, mark the diagonal lines from each corner to the opposite corner. Mark a third vertical line through the middle of the envelope. Fold along each of the lines.

Marking and folding the envelope.
2.

Cut along the top two “V”-shaped lines (discard the top of the envelope).

Cutting the envelope.
3.

Open up the envelope, flattening the bottom a bit. Tuck one side of the envelope into the other side.

Folding the envelope.
4.

You now have a tetrahedron! To decorate it: untuck it, draw on the sides (but not on the tucked-in side), then re-tuck one side in.

A finished tetrahedron craft.