vertex
the endpoint that is shared by 2 rays
In mathematics, a vertex is a point where two or more lines, curves, or edges meet. It is the common endpoint of two or more line segments, angles, or curves. A vertex can also refer to the highest or lowest point on a parabolic curve. In geometric shapes such as polygons and polyhedra, vertices are the corners or points where the edges meet. The plural form of vertex is vertices. In computational geometry, a vertex is often represented as a pair of coordinates, typically (x,y) in two-dimensional space or (x,y,z) in three-dimensional space. Vertices are fundamental to many mathematical concepts and theories, including graph theory, topology, and geometry.
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