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A cone is a three-dimensional solid with a circular base and a point, called the vertex or apex, that is not in the same plane as the base. The altitude of a cone is the segment that runs perpendicularly from the vertex to the base.
A cone with a base radius r, depicting the vertex, altitude, and the base.
The length of the altitude is called the height of the cone. If the altitude intersects the base at the center, the cone is a right cone. In a right cone, the distance from the vertex to a point on the edge of the base is called the slant height of a cone.
Interactive cone where the height and radius can be change. The slant height is highlighted.
If a cone is not a right cone, it is called an oblique cone. Oblique cones do not have a uniform slant height.
Interactive Cone changing from oblique to right