How to make a regular octagon out of square paper

(page 2)

1st picture of regular octagon out of square paper

01.

Start with a "square base" .

Prepare to rotate the base by 180 degrees so that the top becomes of the open-side.

2nd picture of regular octagon out of square paper

02.

Rotate the base by 180 degrees so that the top becomes of the open-side.

Prepare to apply two valley-folds.

1 2 3 4 5 6 7 8 9 10

11 12