👉 A congeries is a type of mathematical structure that consists of a finite number of points, lines or curves connected by straight line segments. These segments are known as edges and can be either parallel or intersecting. The elements in a congeries are called vertices, which are used to define the shape. Congeries can have multiple types including regular (which means they all lie on a single straight line), irregular (which means there are many curved lines joining them), and convex (which means they form