A vertex (plural vertices) is a point at which two or more sides or edges of a geometric figure meet.
Point A is the vertex of this angle:
Points A, B, C, and D are the vertices of this rectangle:
Points A, B, C, D, and E are the vertices of this square pyramid:
In the pyramid above, Point B is the vertex at the highest point in relation to the base of the pyramid. This point is known as the apex.
Related word vertices.
See also angles, apex.