①按虚线角对角折。②按虚线左右两角向中心线折。③按虚线下面两角向上折。④按虚线上面两小角向外侧折。⑤把下面的三角形向上折,反面的三角形向背后上方折,成图6。⑥把手指伸进箭头所示的空隙,把三角形撑开成正方形,成图7。⑦在头 ① according to the dotted corner diagonal fold. ② according to the dotted line left and right corners to the center line discount. ③ according to the dotted line up below the two corners. ④ according to the dotted line above the two small corners to the outside fold. ⑤ the lower triangle folded up, the back of the triangle folded back to the top, into Figure 6. ⑥ finger into the gap shown by the arrow, the triangle distracted into a square, into Figure 7. ⑦ in the head