How to make the Great Origami Pyramid (page 14)

 

25. Now, let's work on the triangle located on the edge plane.   Here, S is the height of the triangle.   Using utilizing two expressions for S, we can get the value of φ.   Thus, the slop angle φ is evaluated as 58.3°.

 

 

 

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Now, you have completed making Great Origami Pyramid.