Vertex calculator to find out the co-ordinates of X and Y component based on the value of a, b and c. Each angular point of a polygon, polyhedron, square, rectangle or any two lines form an angle or in a point where an axis meets a curve or surface is called vertex. More than one vertex of an object is called as vertices. To find the vertex of the X, Y co-ordinates, enter a, b and c values and hit on the calculate button provides the result.