Not rectangle point. How to get intersection point coordinates of surface?

[takeokaE5KAS]

I made a surface by curves. When I tried to get the each intersection point coordinates of surface, but each points are rectangle point.
Please tell me how to get the intersection point coordinates.

Thank you

[jacob.small]

Not sure if this is what you want, but: Surface.PerimeterCurves > Curve.StartPoint might do the trick.

[takeokaE5KAS]

Dear Jacob,
problem solved!
I appreciate your kindness.