# Right Circular Cone

**In elementary geometry, cones are assumed to be right circular,** where right means that the axis passes through the centre of the base at right angles to its plane, and circular means that the base is a circle. A right circular cone is obtained when one base of a right circular cylinder is shrunk to a point, vertex. The radius of the base is represented by 'r', and 'h' is the height of a cone. The variable 'l' is used to represent the slant height, which is the distance from a point on the circumference of the base to the vertex.