Name given to certain main vertices in a plane figure or a solid.

The point at which all the generatrices of a cone meet is called the **apex**. It is also the vertex of the cone.

The meeting point of the vertices of the triangles that make up the lateral surface of a pyramid is also called the **apex** of the pyramid.

The vertex of a triangle that is opposite the base used to calculate the area of the triangle is sometimes called the **apex**.

### Examples

- Apex of a solid:

- Apex of a triangle: