The vertices are the "points" of a polygon.
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You can dertimine a number of vertices a polygon has by counting all the dots around the shape
19. sides=vertices
A polygon with nine vertices also has nine sides, and is therefore a "nonagon".
Fourteen. Each polygons has the same number of sides as it has vertices. Therefore, a polygon with 14 vertices must have 14 sides.
A polygon has as many vertices as it has sides and so in this case it will have 20 vertices.