A quadrilateral has 4 sides. It has no vertices as a quadrilateral is a two dimensional shape.
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A vertex is a point where two or more lines (edges) meet. There is no requirement for the figure to be three dimensional. So the correct answer is that is has 4 vertices.
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A quadrilateral has four vertices.
A quadrilateral need not have any vertical sides.
quad -- 4 sides - 4 vertices
Meet at its vertices.
A rectangle is a 4 sided quadrilateral that has 4 vertices and 4 interior right angles.