MathAlgebraLinear algebraVectors and vector spaces

Vector dot product

Obtuse angle

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Let $\varphi$ be the angle between vectors $\vec{a}$ and $\vec{b}$ . Knowing that $\varphi\in \left[90^{\circ}; 180^{\circ}\right)$ , find the right statement.

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\vec{a}\cdot\vec{b} \ge 0

\vec{a}\cdot\vec{b} = 0

\vec{a}\cdot\vec{b}\le 0

\vec{a}\cdot\vec{b} < 0

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