What aspect of a truss contributes to its rigidity?

The rigidity of a truss is primarily influenced by its geometric configuration, and the use of triangular geometry is a fundamental aspect that enhances this rigidity. Triangles are inherently stable shapes; when a force is applied to a triangle, the structure distributes it evenly throughout the frame without altering the angles of the triangles themselves. This ability to maintain shape under load allows trusses to efficiently support loads over large spans.

In contrast, other options may contribute to the overall strength and performance of a truss but do not specifically address rigidity in the same way. The material used in construction can affect strength and weight, but rigidity is closely linked to structural form. Connection types can influence how forces are transferred through the truss, but they do not provide the same stable geometric configuration as triangles. Finally, while the length of truss members can affect the overall design and stress distribution, it is the triangular arrangement that fundamentally offers stability and resistance to deformation under load.