# Chapter 3 - Vectors - Questions: 10b

$\vec{D}$ and $\vec{E}$ have negative dot product with $\vec{A}$.

#### Work Step by Step

Recall the dot product formula: $\vec{a} \cdot \vec{b} = |a| |b| cos\phi$ Since both $\vec{D}$ and $\vec{E}$ have the same length and cosine is negative in the II and III quadrants, $\vec{D}$ and $\vec{E}$ have negative dot product with $\vec{A}$.

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