Angular sections

(Math.) a branch of analysis which treats of the relations of sines, tangents, etc., of arcs to the sines, tangents, etc., of their multiples or of their parts.

See also: Section

References in periodicals archive ?
It features symmetrical angular sections with equal sides; all the support sections and stepped beams can be used for all four sides.
The center, which features angular sections that appear to be falling on top of one another, opened to great acclaim in the spring of 2004.