Vector has magnitude units

PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

Vector

\mathbf{a}

has magnitude

5

units, vector

\mathbf{b}

has magnitude

6

units, and their cross product has magnitude

15

units. Find the angle between

\mathbf{a}

and

\mathbf{b}