There is more than one way to triangulate parts. Here are two models for you to choose from-
Practice 1 (data from Paper Art Network) (upper right) 1. First, fold the rectangular paper in half on the long side; 2. Fold the left and right parts in half, and then restore them, leaving a crease; 3. Then fold the upper left corner 45 to the center line; 4. As shown in the figure, rotate the lower left corner upward by 45; 5. Then fold the two trapeziums in the lower half upwards; 6. Fold the left and right parts in half as shown by the arrow.
Yes; 7. That's it!
Method origami institute) is folded as shown on the right. Triangulation products: You can find many achievements about the course of origami triangulation on the Internet, among which the classic ones are Triangle Swan and Pineapple, many of which are very simple. There is a special course of swan triangulation (as shown below), so it will be time-consuming. Those who like challenges may wish to have a try.