A vertex is a point that is the endpoint of two or more noncollinear line segments or rays.^{[1][2]} The plural of vertex is vertices.
Diagram  Description  


The vertex of an angle is the point where the lines intersect that form the angle.  

The vertices of a triangle are the points where the sides of the triangle intersect.  

The vertices of a polygon are the points where the sides of the polygon intersect.  

A vertex is also the inflection point of a parabola or a polynomial. This is the point where the curve changes direction. 
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