could you please tell me how to count polar angle of a point with respect to another one using cross product?

I know that polar angle of a point [itex]p_0[/itex] with respect to point [itex]p_1[/itex] is the angle of vector [itex]p_1 - p_0[/itex].

For example, polar angle of

**(3,3)**with respect to

**(2,4)**is the angle of

**(1,-1)**which is 315 degrees or [itex]\frac{7 \pi}{4}[/itex] radians.

How to count it using cross product?

Thank you.