excel to gcode

Thank's Tom and others, Tom got it, I'm using ATAN2(X,Y) and getting
points from Z and Y axis.
What I'm trying to cut looks like a bracelete, it's kind of oval and
the side walls are not parallel.
Can not just rotate A axis as the X and Z axis needs to move at the
same time.
I'm using Deskcnc. A axis goes from 0 to 360 plus or minus and
adding past the 360.
Fogassa.