A quadrilateral has four vertices.
Explanation: The term ‘quadrilateral’ is derived from the Latin words ‘quadri’, meaning four, and ‘latus’, meaning side. Therefore, a quadrilateral is a polygon that consists of four sides, and consequently, it also has four corners or vertices. Each vertex is a point where two sides of the quadrilateral meet. Common examples of quadrilaterals include squares, rectangles, trapezoids, and rhombuses, all of which adhere to this fundamental property of having four vertices.