👉 In geometry, cones are two-dimensional closed figures that have a round shape. They consist of a circular base and a curved surface. The radius (r) of the base is the distance from the center to the edge of the cone, while the slant height (h) is the perpendicular distance between the base and the top of the cone. Cones are used in various applications, such as astronomy, engineering, architecture, and design. They can be hollow or filled with different materials like glass