It is an octagon
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A pentagon
A triangle.
It is an 8 sided octagon
A quadrilateral has 4 sides. It has no vertices as a quadrilateral is a two dimensional shape. * * * * * 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.
Well, you could always count them. Also, the number of sides is always equal to the number of vertices.