Math Problem Statement
tứ diện ABCD có AB=AC=AD và góc BAC=góc BAD=60 độ. HÃy xác định góc giữa các cặp vecto AB và CD
Solution
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Math Problem Analysis
Mathematical Concepts
Vectors
Geometry
Dot product
Angle between vectors
Formulas
Dot product formula: \( \overrightarrow{u} \cdot \overrightarrow{v} = |\overrightarrow{u}| |\overrightarrow{v}| \cos \theta \)
Theorems
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Suitable Grade Level
Advanced High School