A point where any two edges of a quadrilateral meet, is called a vertex of a quadrilateral.
A quadrilateral is expressed graphically by connecting the endpoints of four line segments as a closed geometric shape. The endpoints of the four line segments are intersected at four different locations and each intersecting point of every two line segments of a quadrilateral is called a vertex of a quadrilateral. So, a quadrilateral has four vertices possibly.
$□ \, CDEF$ is a quadrilateral and it is formed by four line segments.
Therefore, the intersecting points $C,$ $D,$ $E$ and $F$ are called the vertices of the quadrilateral $CDEF$.
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