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A Formula for Finding Angle between Two Planes 計算兩平面之交角的公式
Author:
Alex CHIK
Topic:
Planes
GeoGebra
Proof (partial)
dihedral angle formula.pdf
GeoGebra
Reference
1.
https://youtu.be/TRf6gax6viA
2.
http://whistleralley.com/polyhedra/derivations.htm
gMath 互動數學教室
http://www.gmath.hk
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