Xếp hình chóp

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$ Tetrahedron Copyright 1998 Stephen Hecht. All Rights Reserved A dollar bill (66mm x 157mm) produces a model 38mm on a side. A B 3. Swing behind. 2. Pivoting on A, bring B to 1. Either side up. horizontal crease. Repeat Mountain crease bisector. symmetrically. Propagate 60- degree valley creases, for a total of 8 creases. Trim corner D E C o 60 6. Model is now 3-D. Wrap around with 120-degree 4. Reverse-fold. planar valley folds, and tuck E Rotate 60 degrees. into pocket on right side of front 5. Triangle C will be the base of face. the tetrahedron. All valley folds are 120-degree planar angles. Tuck D into pocket at bottom edge of C. 7. Done. There are 2 pockets you could have tucked E into. The one in the front face covers the seam, but locks loosely. The one in the right face makes a tighter lock, but leaves the seam visible.