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Triangular based Pyramid
A point. Other shapes may not have straight sides but that does not mean that they do not have sides.
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.
Two shapes are similar when the sides of one are directly proportional to the corresponding sides of the other. That all the corresponding angles are equal.
Regular hexagons and other shapes based on hexagons. Polygons with 6k sides (positive integer k) where sets of k adjacent sides and angles are congruent to the next set, and other shapes based on these.