math explorations through tetrahedra
1. five intersecting tetrahedra
2. origami model
3. lavenderhome - 5 Intersecting Tetrahedra
4. envelope tetrahedron
5. Thoki Yenn - half tetrahedron
6. references for further explorations
1. Mathigon - folding instruction
https://static.mathigon.org/origami/star.pdf
2. 오더리탱글 만들기(2021 당진 온라인 수학축전)
https://youtu.be/8EUndSvxBFw
3. Arthur Lee - Cube and Tetrahedron
https://www.ggbm.at/CcXzmKtR
4. Arthur Lee - three tetrahedrons
https://www.ggbm.at/zdJXXb8E
5. Matematicas Visuales - The volume of a Tetrahedron
http://www.matematicasvisuales.com/english/html/geometry/space/voltetra.html
6. 關樹培&陳詠心 - 數學、摺紙及GeoGebra: 等邊三角形的探究
http://www.hkame.org.hk/hkmec13/notes/KWAN%20S%20P.pdf
7. Thomas Hull - project Origami P111-123
8. Rick Beech - Origami: the complete guide to the art of paperfolding P235-237
9. 布施知子 - 摺紙童話(3): 立體盒子