How to make the Great Origami Pyramid (page 13)

 

23. Here I will show you how to get the angle φ from the angle θ.

24. Let's work on the triangle located at the midplane of the pyramid.   The triangle is painted with a light blue color in the step #23.   By using the Pythagorean theorem, we can get the length of S.

 

 

 

1 2 3 4 5 6 7 8 9 10 11 12 13 14