Hexagon (120 degrees)

This is the easiest variation besides the pentagon. It is a subset of the triangle variation, and it does not require cutting or inside folds.

Prerequisite: A completed base Penultimate unit.

Step 1. Using the top flap only, fold the top edge of the little triangle to the crease sitting at 45 degrees.

Top flap's little triangle folded so its top edge meets the crease sitting at 45 degrees

Step 2. Still using the top flap, fold the newly formed crease in Step 1 to overlap with the crease sitting at 45 degrees. Keep the fold in place.

Crease from Step 1 folded again, still on the top flap, to overlap with the 45 degree crease, with the fold held in place

Step 3. Fold all remaining flaps down along the crease created in Step 2. You now have a 120 degree angle!

All remaining flaps folded down along the Step 2 crease, completing the finished 120 degree hexagon angle