Mathematics

Problem

Consider two non-zero vectors

\mathbf{p}

and

\mathbf{q}

with

\mathbf{p}\cdot\mathbf{q}<0

and

\mathbf{p}\times\mathbf{q}\neq\mathbf{0}

. Which one of the following statements is correct about the angle

\theta

between

\mathbf{p}

and

\mathbf{q}

? a)

0^{\circ}<\theta<90^{\circ}

\theta=90^{\circ}

90^{\circ}<\theta<180^{\circ}

\theta=180^{\circ}