How to create a closed polyline from enclosed area by multiple lines or curves

[archz2]

I’m in search of a method to create a closed polyline from enclosed area by multiple lines or curves. I can do it in Grasshopper using Heteroptera plugin.

But I don’t know the method in Rhino. In autocad, the keyboard shortcut “BO”, then enter, activates the boundary command which is often helpful in creating hatches. It automatically generates a closed polyline.

[lucio_zadra]

Could be _CurveBoolean ?
You select the curves and then click inside/outside to identify the region you want to obtain.

[archz2]

Oh. Nice. That works! Thanks!