rovinný

rovinný is a Czech adjective that translates to "planar" or "flat" in English. It describes something that lies in a plane, or has a flat surface.

In geometry, the term rovinný is used to describe figures or relationships that exist within a single plane. For example, a rovinný útvar (planar figure) is a shape that can be drawn on a flat surface without lifting the drawing instrument. Similarly, rovinná soustava (planar system) refers to a set of points or lines that all lie within the same plane. This concept is fundamental to two-dimensional geometry.

Beyond mathematics, rovinný can also describe physical objects. A rovinný povrch (planar surface) is a surface that is smooth and level, without any significant curves or undulations. This could apply to a tabletop, a sheet of glass, or a perfectly flat field. The adjective implies a lack of three-dimensionality in terms of curvature, focusing solely on its extent across a two-dimensional area. In essence, it denotes a lack of protrusion or indentation.