What can you do with 40 triangles?

You need 40 pieces of square origami paper.

In the next step I will show you how to make a Triangle out of a Square. :)

How to make a Triangle out of a Square.

Start with a square piece of origami paper

Fold in half. Then unfold picture #1

Fold the upper left corner to crease with new crease starting at lower left corner. picture #1

Turn over and repeat step 1. picture #2

The equilateral triangle is complete. Cut out along lines. picture #3

I decided to cut a piece out of cardboard. picture #1

Instead of folding each piece, I traced the triangle and used a exacto knife to cut them out.

You need to cut 40.

Fold your triangles

Fold triangle in half. Folding one corner to another corner. picture #1

Repeat the other two corners. picture #2

Fold the triangle to look like picture #1. You will have to reverse some of the folds. This is called a Triangular Waterbomb Base.

Fold another triangle. After you have it into the Triangular Waterbomb Base, turn it over and press up on the center. This is called a Triangular Preliminary Base. picture #2

Sit the Triangular Waterbomb Base on the table, put the Triangular Preliminary base on top. picture #1

Wrap the corners of the Triangular Preliminary Base around the sides. I flip mine over for a better fold. picture #2

This is a finished piece.

Make 20

Notice the Tabs and Pockets on the modular. picture #1

To join two modulars together, simply slide one tab on top of the other and slide together. picture #1 and #2

Continue to make a 5 sided shape. picture #2

Continue with the rest of the pieces. Finished model.