Making Maths: Equilateral Triangle Folding

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

Fold the paper in half long-ways, then open it out flat.
Fold a bottom corner up to touch the fold line, making a sharp point on the other corner.
Now fold the two RED edges together.
Fold under the corner and then tuck it in out of the way. Turn over to the smooth side.
Now why not make some more from coloured paper and create some designs.