> For the complete documentation index, see [llms.txt](https://manual.karamba3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.karamba3d.com/3-in-depth-component-reference/3.8-utilities/3.9.17-cross-section-properties.md).

# 3.9.17: Cross Section Properties

The "Cross Section Properties"-component can be used to determine the area and bending properties of arbitrary cross sections with multiple holes. Fig. 3.9.17.1. shows the application to a tube cross section and a comparison to the exact values of an equivalent circular hollow section. 

![Fig. 3.9.17.1: The "Cross Section Properties"-component applied to a tube cross section.](/files/-Mgpuywn-GcC6bsXAE4A)

The component's input-plug "P" expects a list of polylines with straight segments. These need to lie in the global YZ-plane and are assumed to be closed. When counterclockwise with respect to the X-axis they enclose the cross section otherwise an interior hole.

The output corresponds to that of the "Disassemble Cross Section"-component. The output-plug "alpha" returns the angle of inclination of the cross section's principal axes of inertia with respect to local Y- and Z-Axis in radians.

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