vertex
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A vertex is a corner or point where two or more lines or edges of a geometric shape meet. Understanding vertices is important because they define the basic structure and properties of shapes like triangles, squares, and polygons.
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Article
In geometry, a vertex (pl.: vertices or vertexes), also called a corner, is a point where two or more curves, lines, or line segments meet or intersect. For example, the point where two lines meet to form an angle and the point where edges of polygons and polyhedra meet are vertices.
Definition