Secant line a circle in the Euclidean plane, a line joining two of them would be a 2-secant (or "bisecant") and a line passing through only one of them would be a 1-secant (or "unisecant"). A unisecant in this example need not be a tangent line to the circle. This terminology is often used in incidence geometry and discrete geometry. For instance, the Sylvester–Gallai theorem of incidence geometry states that if points of Euclidean geometry are not collinear then there must exist a 2-secant of them. And the original orchard-planting problem of discrete geometry asks for a bound on the number of
A-line (clothing) of flared skirt styles. "True" A-line shapes on the pattern of Dior and Saint Laurent saw a revival in the early 2000s. The A-line skirt has no visible embellishments for ease, such as pleats or slits, but is fitted to the upper hip by means of seams and/or darts. However, denim A-line skirts often have buttons down the center seam. Its fastening is usually kept discreet, with a side or back zipper. A belt is sometimes used. Pockets may be present, but not usually. It can be cut at any length. When referring to dresses and coats, the term "A-line"