What is the meaning of vertex in geometry? The vertex is a point where two or more sides or edges of a geometric figure intersect.
The plural form of vertex is vertices
The vertex of an angle is the point at which two rays intersect.
The vertex of a quadrilateral is the point at which two sides intersect.
Notice that the quadrilateral above has 4 vertices.
The vertex of an a three-dimensional figure is the point at which three or more edges intersect.
The three-dimensional figure above has 8 vertices.