Answer
See the explanation below.
Work Step by Step
The geometrical interpretation of the cross product of two vectors, let us say $u$ and $v$, (can be written as $u \times v$ ) is the magnitude of the cross product of two vectors $u$ and $v$ equals the area of the parallelogram formed by the two vectors.
Therefore, $ \triangle =|\vec{u} \times \vec{v}|$
