# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://manual-2.karamba3d.com/3-in-depth-component-reference/3.8-utilities/3.9.17-cross-section-properties.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.