Kehyskaarta

Kehyskaarta (literally “frame arc” in Finnish) refers to a curved boundary used to shape the edge or opening of a frame, panel, or opening. The term combines kehys (frame) and kaarta (arc), and is used in carpentry, architecture, graphic design, and digital modeling to describe an arc or rounded boundary that defines a frame.

Kehyskaarta can be a simple circular arc, an elliptical arc, or a spline-based curve. In technical drawing and CAD, kehyskaarta is often realized as a fillet or corner rounding, defined by radius and center, or by a set of control points for splines. The curvature is characterized by its radius of curvature and its tangency with adjacent edges, affecting aesthetics and, in some contexts, structural considerations.

In architecture and furniture making, kehyskaarta softens corners of openings and panels, contributing to visual harmony and safety by reducing sharp edges. In graphic design and user interface design, curved borders create visual rhythm and emphasis; scalable vector graphics and CSS allow precise control of kehyskaarta through parameters such as radius and path definitions.

Related concepts include fillet, chamfer, rounded corner, arc, spline, and parametric design. The term is primarily used in Finnish-language technical contexts and may be translated as frame arc or rounded boundary in other languages.