Which type of structure, used in roof supports, is composed of relatively small and lightweight components in a series of triangles?

The correct answer is a truss. A truss is an engineered structure comprised of straight components that are arranged into a series of triangles. This design allows trusses to distribute loads efficiently, making them strong yet lightweight, which is ideal for roof supports. The triangular arrangement helps to reduce material usage while maintaining structural integrity, as triangles are inherently stable shapes that resist deformation.

In contrast, other options like a mansard refers to a specific style of roof design characterized by two slopes on each side, the lower slope being steeper than the upper slope, and does not pertain to the support structure itself. A lintel is a horizontal structural component that spans an opening, such as a door or window, but does not involve a configuration of lightweight, interconnected components like a truss. An eave is the edge of a roof that overhangs the walls of the building and serves more as a design feature rather than a structural support system. Therefore, a truss is specifically relevant to the concept of roof supports using triangles for stability and strength.