How to make a regular octagon out of square paper

(page 8)

13th picture of regular octagon out of square paper

13.

Apply the diagonal valley-fold of the step #12 and then unfold.

Prepare to turn the paper over.

14th picture of regular octagon out of square paper

14.

Turn the paper over.

Prepare to apply a slanted valley-fold which lies at the middle of diagonal and horizontal lines.

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