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{{ printedBook.courseTrack.name }} {{ printedBook.name }} A **cone ** is a three-dimensional solid that has a circular base and a vertex that is not in the same plane as the base. The **altitude** of a cone is the segment from the vertex that is perpendicular to the plane of the base.

The length of the altitude is called the **height** of the cone. If the altitude meets the base at its center, then 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 the cone.

If a cone is not a right cone, it is called **oblique**.