Mathegoras

Vectors and matrices › Vectors in the plane › Dot product

Side length from two dot products

High school · ●●●○○ 50 pts

In △ABC\triangle ABC, AB→⋅AC→=AB→⋅CB→=4\overrightarrow{AB} \cdot \overrightarrow{AC} = \overrightarrow{AB} \cdot \overrightarrow{CB} = 4. Find the length of side ABAB. Round to two decimal places.

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vector addition