When you have the pieces aligned, either pin them in place or grasp them firmly as you shift the package 90 degrees and position it in front of your needle. Sew along the drawn seamline.
Trim off the extra red fabric from piece #1, leaving just a seam allowance.
Fold the green piece #2 away from piece #1 and press it.
If you draw your sewing lines to the edge of the strip, your modules will look like the first two below, with all the triangles the same height. But if you draw your lines so the triangles don't extend all the way across the strip, the triangles will be different heights, as in the last module.
• Do the same thing on a larger scale than your sample.
• Make several modules on the same scale as your sample, and join them into a larger piece.
• Make your foundation wider or narrower than 2 inches.
• Or anything else that strikes your fancy.
Let me know how it works out. If you want to send me a picture of what you made, I’ll post it. Have fun!