ES60 Vectors  Cross Product 
The cross product of two vectors is defined as
where is a unit vector (magnitude 1) perpendicular to the plane defined by and following the right hand rule.
where
and

Let us for example find ...

This is shown graphically here... 
If the vector product of P with the sum of two vectors is taken, the operation is commutative,
where

This is shown graphically here... 