👉 A cercis is a set of points in a plane that are equidistant from a given point (center) and form an ellipse. It can also be defined as a closed curve formed by connecting these points through straight lines. The equation of a circle, for example, is x^2 + y^2 = r^2 where the radius r represents the length of the arc between two points on the circumference of the circle. Circles are important in geometry and algebra because they can be
