Calculation of angles between vectors

[BPP]

Hello everyone
I have a table (Data) that contains a large number of rows in which values of X and Y are found.
What I'm trying to do is get the angles between the vectors that form these points and I do not know if it is possible to do this calculation.
To better understand what I want, I have attached an example of what I want to do automatically, because in order to get what I want first, I must draw these vectors and measure those angles manually and it takes a long time.
In advance thanks for the help

[MartinHanak]

FYI ExampleData_BPP.xmcd contains following line

<generator>Mathcad Professional 14.0</generator>

[ValeryOchkov]

My first try for thinking

[Fred_Kohlhepp · Accepted solution]

mathcad can use vector math!

[BPP]

Thank you very much for the help.