Well, honey, that point is called a vertex. It's where those sides come together and have a little party. Just make sure to bring your geometry hat, because things can get a little wild in there.
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quadrilateral
A pentagon.
there isn't a polygon with 3 sides but there are triangles. polygons start with hexgons; 5 sided shapes.
A polygon that has six sides is hexigon
A regular polygon is a polygon with congruent sides and interior angles.