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vertex (noun) the highest point or the top; the point opposite the base of a triangle.
The vertex of a cone is the top point. The point where two lines meet to form an angle, especially the pint of a triangle.
- The height of a cone is the distance between its vertex and the center of the circle forming the base of the cone. The distance between the top point of the cone and the center of the circle at the base of the cone forms the height of the cone.
- He drew a perpendicular from the vertex, that is, the point opposite the base, to the base of the triangle to measure its height.