Mathematics

Problem

For vectors

\mathbf{a}

and

\mathbf{b}

\mathbf{a}\cdot\mathbf{b}=8

|\mathbf{a}|=5

and

|\mathbf{b}|=4

. The angle

\theta

between them (to the nearest degree) is a)

53^\circ

66^\circ

60^\circ

24^\circ