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Anonymous
A quadrliateral (or quadrangle).
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Hexagon.
The vertices are the "points" of a polygon.
19. sides=vertices
diagonal
A polygon with nine vertices also has nine sides, and is therefore a "nonagon".
A polygon with three vertices and three sides is a triangle. A polygon with four vertices and four sides is a quadrilateral.
A tetrahedron, assuming the four vertices are not coplanar.
HEXAGON
There is no polygon with this name.
Just think
It is a quadrilateral.
A quadrilateral is a polygon with four sides and four vertices.
A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
pentogon
No .. parallelograms are quadrilaterals. A quadrilateral is any polygon with four sides and four vertices.