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A Formula for Finding Angle between Two Planes 計算兩平面之交角的公式

Yazar:Alex CHIK

Proof (partial)

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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