I believe it may be called a diagonal.
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The three segments that connect three non-collinear points form a triangle. Each segment connects one point to another, resulting in three sides of the triangle. The points are the vertices of the triangle, and since they are non-collinear, they create a closed shape with distinct interior and exterior regions.
the anser is rectangle
any closed shape with 4 sides or more sides. The question does not specify only four vertices!
Circle
a polygon is a closed up shape with vertices and sides ,for example a triangle is a polygon because it is made up of 3 sides and 3 vertices