19. sides=vertices
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19. The two numbers are equal.
A polygon has as many vertices as it has sides and so in this case it will have 20 vertices.
12 sides, 12 angles, 12 vertices
Fourteen. Each polygons has the same number of sides as it has vertices. Therefore, a polygon with 14 vertices must have 14 sides.
a hexagon, and it has 6 vertices