A quadrilateral.
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A quadrilateral perhaps
It is a closed plane figure bounded by four straight line segments.
any closed shape with 4 sides or more sides. The question does not specify only four vertices!
Yes they are. The definition of a quadrilateral is a closed figure with four sides. A square always has four congruent sides and is a closed figure. Therefore, all squares are quadrilaterals. Trapezoids, rhombuses, and rectangles are also quadrilaterals.
a square