Define angular momentum.

(N/A) Angular momentum $(L)$ of a particle with respect to a point is defined as the cross product of its position vector $(r)$ and its linear momentum $(p)$.
Mathematically,it is expressed as: $L = r \times p$.
Since $p = mv$,where $m$ is the mass and $v$ is the velocity of the particle,the angular momentum can also be written as: $L = r \times (mv) = m(r \times v)$.
The $SI$ unit of angular momentum is $\text{kg} \cdot \text{m}^2/\text{s}$ or $\text{J} \cdot \text{s}$.