Piecewise-circular curves are geometric constructions made up of multiple segments, where each segment can be represented as a circular arc. Instead of being a single continuous circular arc, the entire curve is comprised of several arcs that are connected at specific points, forming a continuous path. Each arc in a piecewise-circular curve can have different radii, and the points at which they connect can be chosen based on various criteria, such as smoothness, angle, or specific spatial constraints.