A cone is a solid that is formed by taking a circle called the base and a point not in the plane of the circle, called the vertex, which lies above or below the circle and joining the vertex to each point on the circle.

If the vertex is directly above or below the centre of the circular base, we call the cone a right cone.

The height of the cone is the distance from the vertex to the centre of the circular base.

The slant height of a cone is the distance from any point on the circle to the vertex to the circle.