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简易立体几何
Author:
Kee0114
两平面（VAB与VAC）的夹角： 1. 确定VAB与VAC的公共棱VB（黄色） 2. 从两平面各别画垂直线到VB（二垂直线分别为AF、CF） 3. 二平面所成的夹角在红色三角形AFC内，即
4. 应用正弦或余弦定理算出角度
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