How to find some angles with specific degrees when there is no protractor around? Hands-on operation can sometimes solve the "urgent need", as shown in the figure, the rectangular ABCD is known, and we can get a specific angle by following the steps. (1) Fold the paper with the straight line at point A as the crease, so that point B falls on AD, and the crease intersects BC at point E (2) After flattening the paper, fold the paper again with the straight line at point E as the crease, so that point A falls on BC, and the crease EF intersects AD at point F, then ∠ AFE = 67.5. Origami mathematics refers to the study of origami art from a mathematical point of view. For example, study the developability of a specific paper model (whether the model can be flattened without breaking), and use origami to solve mathematical equations.