Making Maths: Equilateral Triangle Folding

Age 7 to 14 Challenge Level:

Here's an easy way to fold any rectangle of paper into a triangle with three sides the same length.

  1. Fold the paper in half long-ways, then open it out flat.
    Step 1

  2. Fold a bottom corner up to touch the fold line, making a sharp point on the other corner.
    Step 2

  3. Now fold the two RED edges together.
    Step 3

  4. Fold under the corner and then tuck it in out of the way. Turn over to the smooth side.
    Step 4

  5. Now why not make some more from coloured paper and create some designs.

Example of a designAnother example of a design

This activity features in our December 2008 Advent Calendar.